This paper examines sales patterns in the first three years of the UK Natio
nal Lottery in order to estimate price elasticity of demand. Our long-run e
stimate is very close to the value of minus one required for revenue maximi
zation. We find that the UK Government has succeeded in setting a framework
for the National Lottery that maximizes turnover and therefore the amount
of money available for both Exchequer revenue and "Good Causes.".