€‹the application of quantitative techniques to purchasing data in an effort to better understand spending patterns and identify opportunities for​ improvement is the definition of

Spending analysis

Explanation: Quantitative review in an individual's spending usually include observation of figures which include the amount spent on the purchase of a number of items. Studying data from purchases made by an individual from a quantitative perspective may be necessary in other to determine efficient cash and financial management as it involves careful analysis of spending with respect to the number of returns received. Spending analysis may be very useful when trying to improve the number or amount of items or goods purchased from a designated amount or budget.

i believe the answer is: returns on investments, no wages

people who belong in upper class society would most likely get there by obtaining multiple source of income, which a certain percentage of ownership for businesses. since most of them are job creator, they would most likely get their money from profit, not wages.