Aggregate demand relates to aggregate expenditures?

nothing

One man's income is another man's expenditure. The expenditure of buyers on products is, by the rule of accounting, income to the sellers of those products. Every transaction that affects income must...

expenditure money paid out; an amount spent expenditure the act of spending money for goods or services expenditure the act of consuming something

total expenses

The total amount of goods and services brought by all the people in the whole economy.