“Ain't it funny, ain't it strange the way a man's opinions change when he starts to face that lonely night.” – Lyrics from the song “Don’t the Girls All Get Prettier at Closing Time” by Mickey Gilley
What happens when something is only available for a short period of time or exists in limited quantities? We want it. Badly. That’s why advertisements and infomercials are always telling you to “act now, before time runs out” if you want to get your hands on the latest, overpriced, completely unnecessary product they’re selling. However, the illusion of scarcity and its effects are not unique to the world of business—scarcity may also affect how we perceive potential sexual and romantic partners. As some evidence of this, consider a classic study on the so-called “closing time effect,” or the idea that everyone gets better looking when the bar is about to close because the window of opportunity for finding someone to take home dwindles.
Research teams visited three bars in a college town at different times of the evening . Specifically, male and female research assistants approached bar patrons of the other sex at either 9:00 PM, 10:30 PM, or 12:00 midnight on a Thursday evening (each bar was set to close at 12:30). The assistants made it a point to avoid selecting patrons who were clearly drunk. Each participant was asked for a global assessment of the attractiveness of all members of the other sex who were currently in the bar. Specifically, they were asked:
“On a scale from 1 to 10, where 1 indicates ‘not attractive,’ 5 indicates ‘average,’ and 10 indicates ‘extremely attractive,’ how would you rate the men/women in here tonight?”
Results indicated that for both male and female patrons, perceptions of attractiveness increased significantly as the night went on. In other words, as the opportunity for meeting potential partners and the number of available options decreased (due to people going home and/or pairing up with others), the remaining people started looking more desirable.
Of course, despite the researchers’ best attempts to screen out drunkards, this study can’t rule out the possibility that this is just an effect of “beer goggles,” because the midnight crew was probably a little more inebriated than the folks who were out earlier. However, a recent replication study found that the changes in perceived attractiveness could not be fully explained by changes in blood alcohol content . Thus, there is something more than just beer at play here.
Another possibility is that perhaps the people who were out later were just single and “on the prowl,” whereas the people out earlier were more likely to be in relationships. In a different replication study, participants were actually asked about their own relationship status . Results revealed no “closing time effect” for participants who were in a relationship; however, for single men and women, perceptions of attractiveness indeed increased as the night went on.
Although none of these studies pinpoint the mechanism definitively, they are consistent with the idea that perceptions of scarcity may influence who you ultimately decide to take home.
 Pennebaker, J., Dyer, M., Caulkins, R., Litowitz, D., Ackreman, P.L., Anderson, D.B., & McGraw, K.M. (1979). Don't the girls get prettier at closing time: A country and western application to psychology. Personality and Social Psychology Bulletin, 5, 122-125. doi:10.1177/014616727900500127
 Johnco, C., Wheeler, L., & Taylor, A. (2010). They do get prettier at closing time: A repeated measures study of the closing-time effect and alcohol. Social Influence, 5, 261-271.
 Madey, S.F., Simo, M., Dillworth, D., Kemper, D., Toczynski, A., & Perella, A. (1996). They do get more attractive at closing time, but only when you are not in a relationship. Basic & Applied Social Psychology, 18, 387-393.
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