Investment has different meanings in finance and economics. Finance investment is putting money into something with the expectation of gain, that upon thorough analysis, has a high degree of security for the principal amount, as well as security of return, within an expected period of time. In contrast putting money into something with an expectation of gain without thorough analysis, without security of principal, and without security of return is speculation or gambling. As such, those shareholders who fail to thoroughly analyze their stock purchases, such as owners of mutual funds, could well be called speculators. Indeed, given the efficient market hypothesis, which implies that a thorough analysis of stock data is irrational, all rational shareholders are, by definition, not investors, but speculators.

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Noun investment (plural investments)

1. A placement of capital in expectation of deriving income or profit from its use.
2. A mixture of silica sand and plaster which, by surrounding a wax pattern, creates a negative mold of the form used for casting, among other metals, bronze.

Sourced

• The line separating investment and speculation, which is never bright and clear, becomes blurred still further when most market participants have recently enjoyed triumphs. Nothing sedates rationality like large doses of effortless money. After a heady experience of that kind, normally sensible people drift into behavior akin to that of Cinderella at the ball. They know that overstaying the festivities — that is, continuing to speculate in companies that have gigantic valuations relative to the cash they are likely to generate in the future - will eventually bring on pumpkins and mice. But they nevertheless hate to miss a single minute of what is one helluva party. Therefore, the giddy participants all plan to leave just seconds before midnight. There's a problem, though: They are dancing in a room in which the clocks have no hands.
  • Warren Buffett, Berkshire Hathaway 2000 Chairman's Letter

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