  We investigate an economic system in which one large agent - the Japan
government changes the environment of numerous smaller agents - the Japan
agriculture producers by indirect regulation of prices of agriculture goods.
The reason for this intervention was that before the oil crisis in 1974 Japan
agriculture production prices exhibited irregular and large amplitude changes.
By means of analysis of correlations and a combination of singular spectrum
analysis (SSA), principal component analysis (PCA), and time delay phase space
construction (TDPSC) we study the influence of the government measures on the
domestic piglet prices and production in Japan. We show that the government
regulation politics was successful and leaded (i) to a decrease of the
nonstationarities and to increase of predictability of the piglet price; (ii)
to a coupling of the price and production cycles; (iii) to increase of
determinism of the dynamics of the fluctuations of piglet price around the year
average price. The investigated case is an example confirming the thesis that a
large agent can change in a significant way the environment of the small agents
in complex (economic or financial) systems which can be crucial for their
survival or extinction.
