In economics, capital refers to produced assets used in the production of goods and services. These assets are created through human effort and ingenuity, distinguishing them from natural resources like land. Capital can be physical (machinery, buildings, infrastructure) or intangible (knowledge, skills, patents). While money can be used to acquire capital, money itself is not capital; it's a medium of exchange. Option (1) is incorrect because capital is a stock concept (representing a quantity at a specific point in time), not a flow concept (measured over a period). Option (4) is too narrow, as capital includes intangible assets as well.