17 Real Entrepreneurs Tell Us The One Thing They Wish They Had Known Before Starting A Business

Starting a business is no small feat. You get advice left and right, and it's hard to know who to believe. To see what advice actually would have been helpful, we've scoured our contacts for entrepreneurs to give us the scoop. For this piece, presented by American Express OPEN, we spoke to heads of billion dollar companies from yours truly to more under-the-radar picks.

Read on to find out what 17 real business owners wish they'd known from day one.

Are you a business owner? Add in your advice in the comments section below.

What I Wish I Had Known...

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