Necessary and Sufficiency Conditions     Graphically prove the following necessary condition given to us by economist Gottfried Haberler: An increasing supply of money and credit is a necessary condition for the occurrence of a long-run boom in the business cycle    Verbally derive the sufficiency condition that there is a sufficient rate of growth in the money supply and credit to establish and maintain the boom of the business cycle    What is the key assumption made in the necessary condition proof

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