Final answer:
The amount invested by shareholders into a company is known as paid-in capital, which is part of the broader shareholders' equity.
Step-by-step explanation:
The amount that the shareholders have invested into the company is called paid-in capital. It represents the funds that the shareholders have invested in exchange for shares of the company's stock. This is distinct from retained earnings, which are the profits that a corporation has earned and retained for reinvestment rather than distributing as dividends. It also differs from accumulated other comprehensive income, which includes unrealized gains and losses not included in the net income, and from shareholders' equity, which encompasses the total of paid-in capital, retained earnings, and other comprehensive income.