Crowding out refers to the times when "increased public sector spending replaces, or drives down, private sector spending." This requires the government to use borrowed money to pay for its spending. Essentially, the government does not have enough money to "pay bills" or finance programs, so it uses money it does not have. This increases the interest rates for "normal" people who then refuse to borrow money (for any reason). This lessens the amount of money the private sector (not controlled by the state) puts into the economy.
Crowding in, on the other hand, is defined as when governmental deficits' spur investment. In this, government spending actually increases a demand for goods. When a demand for goods is high, private sector spending increases.
Crowding out is a macroeconomic situation which originates from government deficit spending. In such a case the government spends more than it has, forcing it to borrow the rest to cover the shortfall. Shortfalls in the economy have a tendency to increase interest rates which ultimately reduces corporate investments. The government, in an attempt to raise more funds, will issue government bonds which will attract most savers away from private bonds. This situation results in the crowding out effect where the private institutions suffer a reduction in their access to the economy’s savings.
Crowding in also originates from government deficit spending but relies mostly on how much the government puts in to increase economic activity. An increase in economic activity creates an opportunity for businesses to increase their operations towards profitability. Thus the private sector crowds in to satisfy increasing consumer needs.
Crowding in advances a counter argument against a strict crowding out hypothesis. This is because while crowding in asserts economic growth due to deficit spending, crowding out suggests increased interest rates caused by deficit spending.
Crowding out is an economic phenomenon which takes place when increased governmental spending decreases private sector investments and fails to increase aggregate demand. Higher government spending, in time of economic prosperity, needs capital. This amount is invested by private investors, including individuals, companies, etc. To attract this capital, government has to raise the interest rate of securities so as to make them attractive. The higher interest rate means high borrowing rates which discourage people from borrowing money and causes private sector investments to fall.
In times of economic recession, people and businesses are desperate to save their money and invest it securely. In such times, the government can borrow money even at a lower interest rate and continue deficit spending. However, in such a scenario, it is likely that government spending will increase productive activities and boost demand, thus leading to increased private sector investment. For businesses, crowding in is a preferable scenario as it boosts profits.