Abstract
This chapter describes a decentralized economy. It assigns ownership and decision making to three distinct economic entities, a household and two kinds of firms. It defines a competitive equilibrium. Two fundamental theorems of welfare economics connect a competitive equilibrium to a planning problem. A price system supports the competitive equilibrium and implies interest rates and prices for derivative assets. The chapter proceeds as follows. It begins by describing the choice problem facing each of the three classes of agents in terms of a Lagrangian. Next it obtains first-order conditions for these Lagrangians. Matching these first-order conditions to the Chapter 5 first-order conditions for the planning problem accomplishes two goals. First, the two fundamental theorems of welfare economics for the economy can be verified. Second, an efficient algorithm for computing the equilibrium price system in terms of the Chapter 5 matrices associated with the multipliers for the planning problem can be described.
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