One advantage of STP is the theoretical possibility to avoid inflation.[4] Complete price stability is achievable, not only because the state plans all prices and quantities, but also because the state has complete control over the money supply via the wages it pays as the sole employer. Therefore, to maintain a fixed currency value, all the state must do is balance the total value of goods available during a given planning period with the amount of wages it pays according to the following equation,[5] where P {\displaystyle P} represents the general retail price level, Q {\displaystyle Q} accounts for the quantity of consumer goods and services, Y {\displaystyle Y} is total household income (wages paid), T P {\displaystyle {\mathit {TP}}} is transfer payments, S {\displaystyle S} is household saving, and T {\displaystyle T} is direct household taxes: