Macroeconomic disadvantages included systemic undersupply, the pursuit of full employment at a steep cost, price fixing’s devastating effect on agricultural incentives, and the loss of the advantages of money because STP eschews money’s classic role.[12] Systemic undersupply was caused in STP because of the use of "material balances" (plans for the balanced production and consumption of goods and productive inputs), which are theoretically possible, but practically impossible to produce because planners cannot acquire enough information to craft them accurately[citation needed]. Additionally, planners had to aggregate many types of goods and inputs into a single material balance because it was impossible to create an individual balance for each of the approximately 24 million items produced and consumed in the USSR.[13] This system introduced a strong bias towards underproduction, resulting in a scarcity of consumer goods.