Sometimes, though, another analogy makes more sense. In this story, the US is the first to climb a cliff. Other countries are tethered to the US by ropes. The overall pace of ascent depends on the burden of debt each country has to carry. One false move by the US will wreck the entire enterprise. Yet the US will only get to the top if the others also make steady progress. At the moment, they are more in danger of losing their footing, thereby dragging down the US.