Excerpt from the Introduction: The immediate objectives of this study are to describe the composition of farm family budgets, classified by income size and household size, and to measure the change in the composition of farm family budgets associated with changes in income and in household size. In other words, to determine to what extent the decision-making units--farm families in this case--allocate their income differently when their incomes change and/or their actual size is modified. Can we give answers, for Corn Belt farmers at least, to such problems as: Do families who experience an increase in income allocate that income between different lines of expenditure in the same way as the families into whose income class they have just moved? Or is the difference in household size a more significant factor in the allocation of income than the level of income itself?