Because its a universally participated in beneficial reciprocality…as in a caring relationship utilizing the reciprocal tool of accounting’s trinitarian formula of equal 1) debits and 2) credits that 3) sum to zero at retail sale which is the very purpose point of economics as in monetary profit from exchange.

Reciprocality/a caring mutually beneficial relationship is a primary aspect of the concept and experience of grace, and that fact is the enlightening and empowering “thing” behind every historical new applied idea/paradigm.

Addendum: Virtually all present discounts are fraudulent in that there is no market for the claimed price before the discount is applied due to the actual austerity of demand. That is why all present discounts must be applied before being eligible for the potent economic and monetary reciprocal nature of the 50% Discount/Rebate at retail sale.