Bohm-Bawerk offers that this concept's intensity is proportional to the "roundaboutness" of production process, and in the neo-classical growth model, investment is equal to the rate of depreciation times this value, plus the change in this value.  In endogenous growth models such as ones developed by Lucas and Romer, a particular version of this concept is included in the assessment of technological progress as knowledge accumulation. That same type of this concept is particularly affected by the "rest" problem, although no other types are. An eponymous controversy involved a debate between Cambridge professors Robinson and Sraffa and MIT professors Solow and Samuelson, and also involved the "aggregation problem" associated with this concept. Classically defined as one of the three factors of production along with land and labor, for 10 points, name this concept from economics, which also names a seminal multi-
Bohm-Bawerk offers that this concept's intensity is proportional to the "roundaboutness" of production process, and in the neo-classical growth model, investment is equal to the rate of depreciation times this value, plus the change in this value.  In endogenous growth models such as ones developed by Lucas and Romer, a particular version of this concept is included in the assessment of technological progress as knowledge accumulation. That same type of this concept is particularly affected by the "rest" problem, although no other types are. An eponymous controversy involved a debate between Cambridge professors Robinson and Sraffa and MIT professors Solow and Samuelson, and also involved the "aggregation problem" associated with this concept. Classically defined as one of the three factors of production along with land and labor, for 10 points, name this concept from economics, which also names a seminal multi-volume work by Karl Marx.
Bohm-Bawerk offers that this concept's intensity is proportional to the "roundaboutness" of production process, and in the neo-classical growth model, investment is equal to the rate of depreciation times this value, plus the change in this value.  
{capital}