`Prove what?' 
 
`What are the questions the History of Economics asks?', is another 
simple question. 
 
Aggregate expenditure includes investment expenditure, and in the 
Accounts, investment = saving; so raising aggregate expenditure OF A 
CERTAIN SORT, will raise saving; and, if investment is productive, it 
will raise aggregate expenditure in the long run (assuming no excess 
capacity in the economy). 
 
 
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