An autonomous economic system, i.e., a country, tends to be a conservative and a symmetrical system in Keynes Space (Output, Money and time), and can therefore be represented as a complex numbers system. This presentation makes it possible to aggregate (or disaggregate) the system at all levels, from the individual to the most general aggregate (and vice versa). It also offers a simultaneous solution of the problem of allocation and distribution of useful resources in the market.