The Crocs production function is q= 22.71 068 0.48 where L is labor and K is capital. Epple, Gordon, and Sieg (2010) estimated that the production function for U.S. housing is q = 1.381 0-144 0.856 where L is land and M is an aggregate of all other mobile, nonland factors, which we call materials. Haskel and Sadun (2012) estimated the production function for U.K. supermarkets is q= L0-25K0.10 0.66 where L is labor, K is capital, and M is materials. Are the returns to scale decreasing, constant, or increasing for each of these production functions? The Crocs production function, q = 22.71 0.08 0.48 exhibits returns to scale