"...consider two theories of economic destruction, which can be labeled the domino theory and the popcorn theory. Everyone knows the domino theory; it is the analogy that is commonly used to denote contagion. If one domino falls, it will topple the others, and conversely, if the first domino remains upright, the others will not fall. It is this logic that underlies most bailout strategies. The popcorn theory emphasizes a different mechanism. When popcorn is made (the old fashioned way), oil and corn kernels are placed in the bottom of a pan, heat is applied and the kernels pop. Were the first kernel to pop removed from the pan, there would be no noticeable difference. The other kernels would pop anyway because of the heat. The fundamental structural cause is the heat, not the fact that one kernel popped, triggering others to follow."