  This paper describes an agent-based model of interacting firms, in which
interacting firm agents rationally invest capital and labor in order to
maximize payoff. Both transactions and production are taken into account in
this model. First, the performance of individual firms on a real transaction
network was simulated. The simulation quantitatively reproduced the cumulative
probability distribution of revenue, material cost, capital, and labor. Then,
the response of the firms to a given exogenous shock, defined as a sudden
change of gross domestic product, is discussed. The longer tail in cumulative
probability and skewed distribution of growth rate are observed for a high
growth scenario.
