Neoclassical economics is the dominant form of economics used today and has the highest amount of adherents among economists.[dubious ] It is often referred to by its critics as Orthodox Economics. The more specific definition this approach implies was captured by Lionel Robbins in a 1932 essay: "the science which studies human behavior as a relation between scarce means having alternative uses." The definition of scarcity is that available resources are insufficient to satisfy all wants and needs; if there is no scarcity and no alternative uses of available resources, then there is no economic problem.