Most venture backed investments fail because the venture capital is used to scale the business before the correct business plan is discovered. That scale/burn rate becomes the cancer that kills the business.
I should also say that for businesses that don’t have the benefit of venture capital backing, the reverse is probably true. Almost certainly non-venture backed businesses will not have the ability to get too big too fast. They will mostly fail because they have the wrong business plan and they don’t have the wherewithal to survive for the period of time it takes to figure out the correct one.
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