For the log-log model ln(Y)=β0+β1ln(X)+ϵ\ln(Y) = \beta_0 + \beta_1 \ln(X) + \epsilonln(Y)=β0+β1ln(X)+ϵ, how is β1\beta_1β1 interpreted?
Elasticity
Semi-elasticity
Level change
Average growth rate