Another classification of investment may be private investment or public investment. Private investment is on private account, i.e., by private individuals, and public investment is by the government. Private investment is influenced by marginal efficiency of capital i.e., profit expectations and the rate of interest. It is profit-elastic. Public investment is by the state or local authorities, such as building of roads, public parks etc. In public investment, profit motive does not enter into consideration. It is undertaken for social good and not for private gain.
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