This is how the Idea>MVP>Validation happens.

Joe and Brian had been in San Francisco for a few months.

They had no money to pay rent.

So they decided to rent out the loft, they lived in.

To people attending a conference that was happening in town.

They knew hotels get fully booked and some would need a place to stay.

They set up air mattresses on their floor and started advertising online.

BTW, if you haven't guessed it yet. You know them as AirBnB.