Corporate investment rose sharply in 1988 and 1989. With higher stock prices, new equity issues swiftly rose in value, making them an important source of financing for corporations, while banks sought an outlet for funds in real estate development. Corporations, in turn, used their real estate holdings as collateral for stock market speculation, which during this period resulted in a doubling in the value of land prices and a 180% rise in the Tokyo Nikkei stock market index.