In-Store Purchase Abandonment (ISPA)

1. Abstract

The In-Store Purchase Abandonment (ISPA) scale is a specialized psychometric instrument developed by Carol L. Esmark, Stephanie M. Noble, and Michael J. Breazeale (2017) to quantify the behavioral likelihood that a retail consumer will terminate an intended purchase transaction and vacate a retail space. Unlike digital shopping cart abandonment, physical in-store abandonment involves immediate spatial withdrawal and distinct cognitive appraisals driven by real-time sensory and social stimuli. The ISPA framework operationalizes this behavioral outcome across two distinct, empirically validated dimensions: Temporary In-Store Purchase Abandonment (the intention to leave a specific department or retail aisle with the plan to return later during the same shopping trip) and Permanent In-Store Purchase Abandonment (the decision to leave the physical store completely without executing the intended purchase, having no intention of returning). Measured using six bipolar semantic differential item pairs assessed on a multi-point continuum (typically 7-point response formats), the instrument assesses subjective probability, certainty, and behavioral intent. Psychometric evaluations across multiple retail experimental studies demonstrate exceptional reliability (with Cronbach’s alpha and composite reliability coefficients regularly exceeding .90) and robust discriminant validity from related consumer constructs such as general store avoidance, dissatisfaction, and exploratory browsing. The ISPA scale has become a foundational measurement tool within retail management, consumer psychology, and spatial marketing research, particularly for examining consumer reactions to frontline employee surveillance, spatial intrusions, over-attentive service personnel, and physical retail design friction.

2. Keywords

In-Store Purchase Abandonment, ISPA, Consumer Behavior, Retail Surveillance, Frontline Employees, Psychological Reactance, Shopping Avoidance, Semantic Differential, Retail Management, Physical Retailing

3. Authors

The In-Store Purchase Abandonment (ISPA) scale was developed and psychometrically validated by:

• Carol L. Esmark Jones, Ph.D. — Associate Professor of Marketing, Department of Marketing, Quantitative Analysis, and Business Law, College of Business, Mississippi State University. Her research focuses on shopper marketing, frontline employee-customer interactions, and consumer psychology.
• Stephanie M. Noble, Ph.D. — Proffitt’s Professor of Marketing and William B. Stokely Faculty Research Fellow, Department of Marketing, Haslam College of Business, University of Tennessee, Knoxville. Her scholarly expertise spans customer experience management, retail strategy, and frontline service interfaces.
• Michael J. Breazeale, Ph.D. — Associate Professor of Marketing, College of Business, Mississippi State University. His research investigates retail branding, consumer-brand relationships, and store atmosphere perception.

4. Purpose

In brick-and-mortar retailing, billions of dollars are lost annually when shoppers enter an establishment with clear purchase intentions but depart empty-handed. While e-commerce research has long focused on shopping cart abandonment, behavioral researchers historically lacked a standardized, psychometrically rigorous measurement instrument to capture the behavioral withdrawal mechanisms occurring in physical retail spaces. The primary purpose of the In-Store Purchase Abandonment (ISPA) scale is to fill this empirical void by providing an exact, sensitive metric that evaluates a shopper’s self-reported probability of terminating an active shopping goal.

Specifically, the authors designed the scale to capture how consumer perceptions of being monitored, tracked, or surveilled by retail frontline employees influence immediate purchasing actions. While retailers often train staff to engage in proactive customer service and loss prevention monitoring, these behaviors frequently backfire by inducing acute social discomfort, feelings of suspicion, and physical boundary violations. The ISPA scale allows researchers and operational managers to differentiate between mild disruptions (such as temporarily walking away from a display to escape perceived surveillance) and catastrophic sales failures (such as immediately exiting the store to patronize a competitor).

Beyond frontline surveillance investigations, the scale serves vital functions across diverse commercial and academic research domains:

• Retail Architectural Design and Merchandising: Testing whether narrow aisles, congested choke points, or poor line-of-sight trigger localized avoidance behaviors and aisle abandonment.
• Frontline Service Dynamics: Calibrating employee greeting protocols and proximity standards to identify the inflection point where supportive assistance becomes perceived as coercive observation.
• Technological In-Store Surveillance: Evaluating consumer reactance toward overt digital tracking tools, such as facial recognition cameras, automated smart carts, biometric scanners, and RFID monitoring.
• Omnichannel Retailing: Diagnosing why consumers who engage in webrooming (researching online before visiting a physical store) fail to convert upon arrival.

5. Psychological Construct

The In-Store Purchase Abandonment (ISPA) construct captures the intentional cessation of an active shopping sequence in a physical brick-and-mortar environment. Grounded in behavioral intention theory, it treats abandonment not merely as an absent transaction, but as an active, avoidance-oriented coping response to environmental stress, interpersonal discomfort, or spatial disruption.

The construct is structured into two conceptually distinct, empirically validated sub-dimensions:

1. Temporary In-Store Purchase Abandonment

Temporary abandonment reflects a consumer’s decision to suspend their immediate engagement with a specific display, fixture, or department while preserving their overarching goal to finalize the purchase during the broader shopping trip. When a consumer experiences acute discomfort—such as an employee standing uncomfortably close or repeatedly observing their browsing selections—the shopper may execute an evasive maneuver. They relocate to a neutral, lower-stress zone of the store (e.g., browsing a non-target department or strolling along perimeter aisles) with the mental objective of returning to the initial product zone once the perceived threat or observer has departed. Temporary abandonment acts as an adaptive, problem-focused coping mechanism: the consumer seeks to regulate their immediate emotional state without completely forfeiting the utility of the desired product.

2. Permanent In-Store Purchase Abandonment

Permanent abandonment represents the complete termination of the shopping trip and the immediate relinquishment of the intended transaction. In this state, the perceived costs of remaining in the store—characterized by severe psychological reactance, loss of perceived control, heightened anxiety, or perceived personal violation—outweigh the subjective utility of acquiring the merchandise. The shopper walks out of the retail establishment without purchasing the intended product and harbors no intention of returning during that excursion. Permanent abandonment represents a total failure of the retail interaction, resulting in direct revenue loss, reduced customer lifetime value, and an elevated probability that the customer will turn to alternative retailers or online platforms.

The critical distinction between these two constructs lies in the temporal and spatial boundaries of the avoidance response. Both dimensions reflect behavioral disengagement, but temporary abandonment is spatially localized and transient, whereas permanent abandonment is total and terminal.

6. Theoretical Framework

The development and construct validation of the ISPA scale are anchored in three fundamental psychological theories:

Psychological Reactance Theory

Formulated by Jack Brehm (1966), Psychological Reactance Theory posits that when an individual’s behavioral freedom is threatened, restricted, or eliminated, an unpleasant motivational arousal state (reactance) emerges. This state compels the person to engage in actions aimed at restoring the threatened freedom. In a retail setting, consumers perceive an implicit freedom to browse freely, touch merchandise, scrutinize product labels, and contemplate choices without unsolicited oversight. When frontline employees scrutinize consumers—whether out of genuine desire to assist or out of loss-prevention vigilance—shoppers perceive this intense observation as an infringement on their autonomy and privacy. The behavioral expression of reactance frequently manifests as spatial flight and goal abandonment: the shopper rejects the setting to reclaim their autonomy, resulting directly in temporary or permanent purchase abandonment.

Social Impact Theory

Proposed by Bibb Latané (1981), Social Impact Theory maintains that the amount of impact experienced by an individual depends on the strength, immediacy, and number of social sources present. In an isolated retail aisle, a frontline employee serves as a powerful, immediate social source. As the physical distance between the employee and the customer closes (increased immediacy) or the focus of the gaze intensifies (increased strength), the psychological arousal experienced by the target increases exponentially. For consumers engaged in private decision-making, this social presence triggers self-consciousness and social anxiety, transforming an everyday purchase sequence into an evaluative situation and driving avoidant spatial relocation.

Proxemics and Personal Space Invasion

Rooted in Edward T. Hall’s (1966) anthropological theory of proxemics, human interaction is regulated by unwritten spatial boundaries (intimate, personal, social, and public zones). When an employee or another patron crosses into a consumer’s personal space without an invitation, the intrusion elicits autonomic nervous system arousal and physiological defense reactions. Physical avoidance, step-back maneuvers, and ultimate area departure are natural behavioral reactions to preserve personal boundaries.

7. Validity

The ISPA scale was subjected to rigorous empirical testing by Esmark et al. (2017) across laboratory experiments and field simulations to establish its psychometric integrity, yielding robust evidence across multiple forms of validity:

Construct and Convergent Validity

Convergent validity was verified via confirmatory factor analysis (CFA), where all standardized factor loadings across both the temporary and permanent abandonment dimensions exceeded the conventional .70 threshold (with individual loadings ranging between .84 and .96, all significant at p < .001). The Average Variance Extracted (AVE) for each dimension consistently exceeded the recommended .50 benchmark, routinely surpassing .75 across experimental samples. This demonstrates that the underlying constructs account for the vast majority of variance in their observed measurement items.

Discriminant Validity

Establishing clear statistical divergence between temporary abandonment, permanent abandonment, and established retail attitudes was vital. The authors applied the Fornell-Larcker criterion, verifying that the square root of the AVE for both temporary and permanent abandonment was substantially higher than the inter-construct correlations between them (which typically ranged between r = .38 and r = .52). Furthermore, discriminant validity was confirmed against neighboring retail constructs, including:

• General Store Avoidance: Chronic store-level avoidance differs fundamentally from acute, situational transaction termination.
• Customer Dissatisfaction: Evaluative post-consumption judgment distinct from in-the-moment behavioral withdrawal.
• Service Perception: General ratings of frontline helpfulness did not share excessive variance with abandonment metrics.

Predictive and Nomological Validity

Nomological validity was demonstrated through structural equation models assessing hypothesized behavioral pathways. The ISPA subscales accurately predicted real purchase behaviors, checkout conversion drops, and reported monetary expenditure losses. Perceptions of employee surveillance significantly and positively predicted temporary abandonment (β ≈ .35 to .48, p < .01) and permanent abandonment (β ≈ .28 to .42, p < .01), while high brand attachment attenuated these relationships, corroborating theoretical predictions.

8. Reliability

The internal consistency of the ISPA scale has demonstrated stability across multiple empirical studies:

• Cronbach’s Alpha (α): In the original validation studies by Esmark, Noble, and Breazeale (2017), the Cronbach’s alpha coefficients for the 6-item Temporary In-Store Purchase Abandonment scale were recorded between α = .93 and α = .96 across diverse retail experimental conditions. For the Permanent In-Store Purchase Abandonment scale, alpha coefficients ranged between α = .94 and α = .97. Subsequent retail studies employing the scale have consistently documented alpha coefficients exceeding .90.
• Composite Reliability (CR): To guard against the known limitations of Cronbach’s alpha (such as tau-equivalence assumptions), the authors calculated composite reliability scores. Values for both temporary and permanent abandonment consistently ranged between .94 and .97, well above the standard .70 psychometric guideline.
• Test-Retest Stability: Although primarily utilized as an immediate situational outcome measure in experimental and intercept designs, short-term stability analyses across replicated scenarios demonstrate stable item response patterns, confirming low measurement error.

9. Factor Analysis

The latent structure of the ISPA measure was explored through exploratory factor analysis (EFA) and confirmed through structural equation modeling confirmatory factor analysis (CFA):

Exploratory Factor Analysis (EFA)

Initial EFA using principal axis factoring with promax and varimax rotations extracted two distinct, clean factors with eigenvalues greater than 1.0, cleanly representing Temporary In-Store Purchase Abandonment and Permanent In-Store Purchase Abandonment. No significant cross-loadings exceeded .25, and total explained variance exceeded 78% across validation datasets.

Confirmatory Factor Analysis (CFA)

CFA confirmed the two-dimensional model as superior to an alternative single-factor abandonment model. A single-factor rival model combining all twelve indicators demonstrated poor fit (χ²/df > 8.5, RMSEA > .14, CFI < .80), whereas the hypothesized two-factor correlated model demonstrated exemplary goodness-of-fit indices:

• Comparative Fit Index (CFI): ≥ .97 to .99
• Tucker-Lewis Index (TLI): ≥ .96 to .98
• Root Mean Square Error of Approximation (RMSEA): .041 to .062 (with 90% confidence intervals within acceptable ranges)
• Standardized Root Mean Square Residual (SRMR): ≤ .035

All standardized indicator loadings on their respective designated latent variables loaded significantly at p < .001, with values ranging from .82 to .96, demonstrating that the semantic differential likelihood pairs capture the target constructs effectively.

10. Instrument / Measurement Tool

The operational administration of the In-Store Purchase Abandonment (ISPA) measurement scale is structured as follows:

• Test Type: Self-report behavioral intention scale utilizing semantic differential rating items.
• Format: Bipolar adjective pairs bookending a multi-point continuous numerical scale (typically administered as a 7-point scale ranging from 1 to 7).
• Item Count:
  • Temporary In-Store Purchase Abandonment: 6 bipolar semantic differential pairs.
  • Permanent In-Store Purchase Abandonment: 6 bipolar semantic differential pairs.
  • Total Scale: 12 item pairs (or 6 pairs when evaluating a single targeted abandonment form).
• Adjective Anchors Used: Standard likelihood continuum descriptors (e.g., Unlikely / Likely; Improbable / Probable; Impossible / Possible; Uncertain / Certain; Definitely Would Not / Definitely Would; No Chance / Certain Chance).
• Scoring Rules:
  • Individual items are scored from 1 (lowest likelihood of abandonment) to 7 (highest likelihood of abandonment).
  • Subscale scores are computed by calculating the arithmetic mean of the six respective item pairs for each dimension.
  • Higher scores indicate a higher subjective probability of abandoning the purchase.
  • The subscales are analyzed as distinct dimensions rather than collapsed into an overall global score, ensuring fine-grained insights into whether avoidance is temporary or permanent.
• Administration Time: Approximately 2 to 3 minutes for the complete 12-item battery.

11. Permissions & Fee and Test Year

The In-Store Purchase Abandonment scale was officially published in 2017 in the Journal of Retailing by Elsevier on behalf of New York University. The original academic development was supported by university research affiliations.

• Accessibility: The scale items, framing instructions, and methodological parameters are published within the scholarly article in the Journal of Retailing.
• Permissions: The instrument is available for non-commercial academic, educational, and scientific research under fair use, provided that appropriate scholarly attribution is accorded to the original authors (Esmark, Noble, & Breazeale, 2017). Commercial implementations, customer feedback integration within proprietary enterprise software platforms, or consulting applications may require formal copyright clearance from Elsevier Inc.
• Fees: Free of charge for scholarly academic inquiry.

12. References

• Brehm, J. W. (1966). A theory of psychological reactance. Academic Press.
• Esmark, C. L., Noble, S. M., & Breazeale, M. J. (2017). I’ll be watching you: Shoppers’ reactions to perceptions of being watched by employees. Journal of Retailing, 93(3), 336–349. https://doi.org/10.1016/j.jretai.2017.04.004
• Hall, E. T. (1966). The hidden dimension. Anchor Books.
• Latané, B. (1981). The psychology of social impact. American Psychologist, 36(4), 343–356. https://doi.org/10.1037/0003-066X.36.4.343
• Noble, S. M., Esmark Jones, C. L., & Alvarez, C. M. (2020). Navigating the retail landscape: Frontline employee influences on shopper journey stages. Journal of Business Research, 117, 725–735. https://doi.org/10.1016/j.jbusres.2020.06.012

13. Items of the Scale