Investors and money managers watch stock markets closely, looking for trends and patterns, and one of the trends they're seeing these days is lots of foreign money moving into US markets.

Some researchers, such as , are finding that the amount of money coming into the US markets is substantial a record $76.5 billion just over the past three months.

says that sometimes can be seen as an omen that markets are nearing their top.

"And foreign investors buying US stocks has consistently been an indicator of a market getting kind of high."

But all market cycles aren't the same, and this latest trend may also indicate the world-leading status of American markets, so when the US dollar is strong, as it is now, money tends to flow into it, he says.

"Yes, they usually come in when the dollar is stronger, so even if the market doesn't go up, the strengthening dollar means that they make more money when they turn the investments back into their own foreign currencies."