Engineering models generally find that most consumers are unwilling to adopt energy efficient appliances, even though the financial returns are positive. It is commonly thought that this is either due to market imperfections such as an incomplete credit market, very high intertemporal consumer...

We apply an incomplete demand system to supermarket scanner data to estimate the effects of a fat tax on dairy products for different demographic groups. We find own-price elasticities of demand are relatively inelastic and vary little across groups. A fat tax may be an effective means to raise...