In the conditions of the global changes caused by an increase in a role of information as a production factor, universal application of IT technologies, one of necessary conditions of effective functioning of any economic sphere is the knowledge of laws of its functioning.?In this research laws of short-term dynamics of the cost expenses in the agricultural organizations of the Nizhny Novgorod Region of the Russian Federation engaged in production of one type of agricultural product - grain are investigated.?Various indicators of the amount of economic resources at the disposal of the organization, their ratios and financial results of a production activity were considered as the influencing factors.?During research it was established that different sets of the influencing variables work for different agricultural organizations (broken down into 4 groups according to their size – ultra-small, small, mid-sized, large as to their production volume). For each group the corresponding equations were formulated, the statistical analysis of the importance of coefficients was carried out, and conclusions were drawn on character and degree of regressor influence on dynamics of costs of production.?During research previously expressed assumption that different patterns of the reproductive process are identified for different sized agricultural organizations and further directions for the research are defined.