Shortage economy (Kornai)

In Soviet-type economies, shortages of consumer goods, materials, housing and labour were general and persistent. Kornai argued in Economics of Shortage (1980) that this was a normal state of the system, not the result of mistaken prices or bad plans. Where firms do not fear bankruptcy, their demand for inputs is "almost insatiable": they hoard materials and labour and push for investment, so the economy reproduces excess demand.

• Soft budget constraints make firms' demand insensitive to price and cost.
• Investment hunger: managers and ministries compete for investment funds without bearing the cost of failure.
• Hoarding and forced substitution: buyers take whatever is available, accumulate stocks and adapt products to available inputs.
• Queues and allocation by rank: consumers and firms queue, use connections, or receive goods by administrative priority.
• A sellers' market: producers have little reason to improve quality or respond to buyers.

Kornai contrasted "resource-constrained" socialist economies with "demand-constrained" capitalist ones, in which firms compete for buyers and spare capacity is normal. In The Socialist System (1992) he placed shortage within a causal chain that starts with the party's monopoly of power and state ownership, passes through bureaucratic coordination and soft budget constraints, and ends in typical behaviours. The theory competed with disequilibrium macroeconomics, which treated shortage as repressed inflation that correct prices could remove; Kornai held that price changes alone would not cure it while budget constraints stayed soft.

• Waiting lists of years for cars and flats in the USSR, Poland and the GDR.
• Enterprises in Hungary, Poland and the USSR holding large inventories of inputs while shortages persisted.
• Shortages and queues in Poland in the 1980s and Romania under Ceaușescu.

Economists differ on how much of the measured shortage was systemic and how much reflected fixed prices that could have been raised. Some reform economists argued that partial market reforms in Hungary reduced shortage without changing ownership. Others note that the theory is descriptive and hard to test quantitatively.

The theory became the standard account of socialist economies in the 1980s and influenced transition policy: hardening budget constraints through bankruptcy laws and bank reform was a central task after 1989. Where constraints stayed soft, firms continued to accumulate arrears and bad loans.