« Left-Out and Irrelevant Variables | Main | The Three-Variables Regression Model »

September 27, 2007

Elasticities, Logs, and Functional Form

The definitions of elasticity:

P9270011a.jpg

A candidate production function:

P9270009b.jpg

Another candidate:

P9270011c.jpg

Which do economists prefer? Well, economists like to think about elasticities. For a linear model, the elasticity is not constant.

P9270013a.jpg

For a log-log model, elasticities are constant (and easier to see).

P9270016a.jpg


Posted by bparke at September 27, 2007 09:06 AM

Comments