INSTITUTION is a verbal symbol which for want of a better describes a cluster of social usages. It connotes a way of thought or action of some preval… - Walton Hale Hamilton

An explanation of the "institutional approach" to economic theory is a plea for a particular kind of theory. It is possible to come upon the same object from different angles; but more often those who take different routes chance upon different things. The "institutional approach" doubtless has some importance because it is a happy way to acceptable truth, but its significance lies in its being the only way to the right sort of theory. An appeal for "institutional economics" implies no attack upon the truth or value of other bodies of economic thought, but it is a denial of the claims of other systems of thought to be "economic theory." This, however, is no pointless struggle in method to be carried on by breaking syllogisms over concepts and by engaging in polemics over niceties in statement. On the contrary, it involves the very nature of the problems which the theorist should set himself; its real issue is over what economic theory is all about.

There [is]... a list of five tests which any body of doctrine which aspires to the name of economic theory must be able to meet:

"Institutional economics" alone meets the demand for a generalized description of the economic order. Its claim is to explain the nature and extent of order amid economic phenomena, or those concerned with industry in relation to human well-being. In the words of Edwin Cannan, it attempts to tell "why all of us are as well off as we are" and "why some of us are better off than others." Such an explanation cannot properly be answered in formulas explaining the processes through which prices emerge in a market. Its quest must go beyond sale and purchase to the peculiarities of the economic system which allow these things to take place upon particular terms and not upon others.