Transactions that may be termed "investments" are comparatively recent in human history. They are a characteristic of modern business. In ancient and medieval times investments were infrequent because business men controlled the use of their own property and bartered it in business dealings, just as merchants nowadays do. The earliest forms of wealth were mainly land and precious metals, i.e., coins. Intangible forms of wealth, such as bonds, notes, bills of exchange, or paper money, were almost unknown until modern times.