Is evolution like a well-tuned car that purrs down the road at a steady pace? Or is it more like an aging, rattling jalopy that often lurches forward? The aging jalopy is a handy metaphor for the ...

American Journal of Agricultural Economics, Vol. 53, No. 1 (Feb., 1971), pp. 63-70 (8 pages) The simultaneous-equation approach is used to formulate a positive spatial equilibrium model consisting of ...

Opposites attract and likes repel is a universal law in nature, with electromagnetic interactions being the most ingrained in our minds, such as the interaction between positive and negative poles, ...

During the past 25 years, regional distribution of U.S. milk production has changed as production in the South and West has grown. While previous studies of the regional distribution of U.S. milk ...