418 lotka: objective standard of value 



several commodities by an individual with a perfect sense of 

 values) the simple relation 



V- = . = ojj = ■ , V J = = w J = {ZZ) 



dnii dm; d/j d/j 



for all values of j and J. 



Thus our problem is solved for the special case here considered : 

 We have found a mathematical expression for the numerical 

 measure of the ''true" or "objective" values of a set of commodi- 

 ties. The "true" value (per unit of mass) of a given commodity 

 A], when the rate of consumption is nij units of mass per head per 



unit of time, is the partial differential coefficient r — of the rate of 



orrii 



increase r per head of the species, taken with regard to mj. 



