I looked up the actual figures after posting -- seems London has about 5x as many international visitors, so you are absolutely right.<p>But, I think in Rio there is also an argument to be made of how many of those &quot;estimated&quot; visitors are actually simply displacing people who would otherwise have travelled to Rio. To your point, if Rio is in fact no set-up to accommodate as many people as London, then a lot of the effect of the games will simply be substituting regular travelers with Olympics watchers.<p>Either way -- the only point I guess I was really trying to make was that the variable of interest is the delta in the actual visitors to Rio -- you want an economist making this argument, not a health expert