Correct me if Im wrong.
The high ratios you see are due to the charitable donation. The
charitable donation is for the betterment of the company as an anti-takeover pill.
However, when comparing it to American Express, Mastercard is indeed over-valued, but not bubble levels. The street is betting on continued growth. However, there is still the lawsuit issue. The street had focused on this issue strongly last year and thats what kept it in the 40s. This year its become a non-issue, however, the lawsuit issue is still there.
There is also the factor that MA had turned in some flat quarters in its private years.
MA is priced at a premium. It must continue its growth. If either growth or the lawsuit issue comes to bare, then MA will fall very quickly. It fell 20% in one day on the last earnings call.
Watch the earnings calls, watch the lawsuit issue. This will make a great daytrade short when the bad news comes out.
Even better, Cramer is pimping the stock. This should make any fall even larger. It will happen in a day though so you have to get in on the short as the news comes out.