What should count as a reason?

2000: “Now is the time to buy gold. It’s at an all-time low, which means the factors driving it down must inevitably reverse and make the price bounce back.”

2011: “Now is the time to buy gold. It’s at an all-time high, which means the factors driving it up can only take it even higher.”

2000: “Now is the time to buy a house. Rates are at historic highs and are only going to go higher if you don’t act now.”

2011: “Now is the time to buy a house. Rates are at historic lows and can’t stay down forever.”

2006: “The United States is unusually hot and the carbon dioxide emissions which caused this are only going to make the temperature climb to even more dangerous highs unless we do something right now.”

2011: “The United States is unusually cold and the carbon dioxide emissions which also caused this are only going to make the temperature go back to being really hot unless we do something right now.”