Saving is defined as

A.Accounting difference between current income and consumption
B.Sum of savings made by the different factors
C.Excess of expenditure over available income
D.Amount set aside for meeting unforeseen expenditure
E.None of the above

Trade will occur when

A.Personnel values are different
B.Middle-men can profit by making trade
C.The exchange leads to more preferred situation for the traders
D.There is enough disparity between the consumption-substitution ratios to cover the costs of trades
E.All of the above