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Assumptions and Conditions in the Arrow-Debreu Equilibrium Model

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In general, there are two ways of financing, direct finance and indirect finance. In direct finance, households directly purchase the securities issued by firms through securities market. Thus, households have to judge and absorb firm¡¦s credit risks directly. On the other hand, in indirect finance, firm¡¦s credit risks are judged and absorbed by financial intermediaries who mediate funds collected from households to firms. Both financing methods play an important role in whole economic activities.

Simply speaking, there are four main players involved in financing activities. Each player has different specific functions that related to the others, financing activities would not be able to be held if one of them were not exist. The …show more content…

B. Banks
In this model, the role of the bank is as fund provider for firms. Banks extend loans to firms (L+) to meet the firms demand in funds. In some ¡§bank centered¡¨ countries such as Japan, China, and Indonesia this role become very important. The bank itself rely their funding upon money deposits from households (D-) and securities market (Bb).

C. Firms
In order to make more profit (maximize it), firms need to make investment. However, when it comes to major investments that need large amount of money, firms can not finance those investments by themselves . Investment is funded through loans from banks (L-) or securities market by issuing stock or bonds.

D. Securities Market
In securities market, demand of securities from firms (Bf), as well as those from banks (Bb) meet the supply from households (Bh).

In order to reach the general equilibrium state, there are some conditions that need to be fulfilled in Arrow-Debreu general equilibrium model, and those conditions are :
1. I = S
Investment made by firms has to be in equal amount as the saving made by households.

2. D+ = D-
Demand of money deposit from bank has to be fulfilled by the supply of deposit from households.
3. L+ = L-
Supply of loans from bank has to cover demands made by firm completely
4. Bh = Bb + Bf
Supply of fund provided by households through securities market has to be equal as

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