Question

supply creates its own demand and therefore events like the great depression were largely ruled out by classical economists. keynes, however pointed out that blank did not necessarily always hold because some agents in the economy might decide to blank portions of their incomes. if enough individuals did this significant recessions might emerge and persist

Answer 1

As per information provided by you, here the answer.

Yes, supply creates its own demand and therefore events like the great depression were largely ruled out by classical economists. Because classical economists believed in the theory of say's law. which basically based on the assumption that supply creates its own demand, with less chances of occurrence of events like the great depression.

On the other hand, According to keynes, demand creates its own supply, opposite to say's law that supply creates its own demand. Therefore,  keynes, pointed out that blank did not necessarily always hold because some agents in the economy might decide to blank portions of their incomes, if enough individuals did this significant recessions might emerge and persist.