This remains true only while currency continues to be in its normal state and all other static adjustments continue complete. _Influences that disturb the Static Equilibrium._--It might seem that the influences that disturb such a static equilibrium are too numerous to be described; and yet these changes may be classed under five general types:-- 1. _Growth of Population._--The supply of labor is increasing, and this fact of itself calls for continual readjustment of the group system. 2. _Increase of Capital._--The amount of capital is increasing, and this change also disturbs the static equilibrium and calls for a rearrangement. As far as wages and interest are concerned, the effect of this latter change is the opposite of that which follows an increase in the amount of labor. When people become more numerous, other things remaining equal, their individual earning capacity becomes smaller. The increase of capital reduces the earning power of each unit of the supply of it and depresses the rate of interest; but it raises the rate of wages, for it causes labor itself to act more efficiently. It is to be noted, indeed, that when new laborers enter society they become consumers as well as producers, and this affects the utility and the value of goods. When more people use a given amount of consumers' wealth, values, measured in ultimate units of utility or disutility, rise. An increase of capital does not directly neutralize this effect, since it does not change the number of consumers; but it multiplies commodities and brings down their utilities and their values. The rise of "subjective" values which follows an influx of laborers is an indication of diminished wealth per capita, and the reduction of values which follows an influx of capital is a sign of increased wealth per capita. 3. _Changes of Method._--Changes take place in the methods of production. New processes are devised, improved machines are invented, cheap motive powers are utilized, and cheap and available raw materials are discovered, and these changes continually disturb the static state. There are certain to be improvements on the older methods of production, for a law of the survival of the fittest insures this.