With any seller, confirm that they have a return policy that would allow you sufficient time to have something authenticated and return it if it turns out to be a fake.
Economists will confirm that not only the return differentials within capital itself (bonds versus stocks to keep it simple) but the division of GDP between capital, labor and government can significantly advantage one sector versus the other.
Furthermore, the Bank of America Merrill Lynch high-yield indices in the U.S. and in Europe confirm this pattern: the total return in the year to date stands at 9.28% in the U.S., versus 12.76% in Europe.