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The risk most fear is losing the ability to provide for yourself and family, for most people that is only one or two significant financial mistakes away.

...which is another way of saying they lack the surplus capital to speculate on starting a company.

There are plenty of businesses where entire countries don't have enough capital to start a competitor (e.g. oil companies, aircraft factories).

It's called capitalism, not "I have an idea-ism" for a reason.

There are some businesses that operate in markets with low barriers to entry but they tend to be A) new and extremely risky or B) hypercompetitive.