They all exist on the same continuum, is all I am saying. Some forms of what most would call "gambling", e.g. Texas Holdem Poker, are "investing" to the point where many people earn a living doing do it.
Poker is a high stakes bidding game, but I would not classify it as a gamble (although many colloquially refer to it as such). This is why there are professional poker players, but not professional players of games that involve pure chance.
And lots of things people call "investing" actually perfectly fits your definition of gambling. (Nobody who invests in Bitcoin has any influence on the outcome, for instance).
I guess I didn't phrase my definition correctly. I didn't mean to imply that the investor changes the outcome, I mean that the investment outcome is dependent on what the investor chooses to invest in. The market outcome is (basically) predetermined, and the investor's skills determine whether that outcome increases their value or decreases their value.
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