Three years ago, I gave thanks for how cheap oil was pulverizing Vladimir Putin, the Organization of the Petroleum Exporting Countries and other global turkeys. This year, Americans and investors have at least as many reasons to be thankful, transcending the poisoned U.S. politics we’ll all — ahem — carefully avoid at Thanksgiving dinner. Right? Let’s count ‘em up. Number six is the one that counts most. 1. We have a really solid world economy 2. Unemployment near a 17-year low and middle-class real incomes at a record3. Low interest rates mean high purchasing power4. Oil’s still cheap.5. Our family still loves us (and doesn’t give a fig about bitcoin)6. Markets still work — including, especially, the marketplace of ideasvia