According to the Hot Waitress Index: the weaker the economy, the larger the proportion of attractive waiters/waitresses. The reasoning is that attractive people do not have trouble finding high-paying jobs in a strong economy. But in a weak economy, these jobs will be more difficult to find. Thus, more attractive people will be forced to work in lower paying jobs.
Of course, economic theory contends that employment is a lagging indicator, rendering it a less-useful metric for predicting the direction and momentum of the economy; however, the Hot Waitress Index could be a coincident or even a leading indicator, as attractive people may be the first to find better jobs when a bad economy turns good.