Warren Buffett says

“Don’t ask the barber whether you need a haircut.”

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“We trade real estate for technology (which gets cheaper and more capable every year).”

“Any business plan won’t survive its first encounter with reality. The reality will always be different. It will never be the plan.”

“It’s not possible for investors to consistently outperform the market. Therefore you’re best served investing in a diversified portfolio of low-cost index funds [or exchange-traded funds].”