Of course it could have been. Look at the amount of money spent on hotels, look at the existing VRBO type options, look at how many people travel to places, try

Of course it could have been. Look at the amount of money spent on hotels, look at the existing VRBO type options, look at how many people travel to places, try to take a guess at trends in airfares and travel preferences. You could certainly get some sort of order of magnitude guesses together. In this case you'd quickly get to "very big" and "global" and would have a nice answer.