"Cluster munitions contain dozens or sometimes hundreds of explosive bomblets, so when they're used, they scatterover a very large area, often the size of several football fields, " Cheeseman said.
The size of the Mexican crater suggests that whatever formed it was about 10km across (and also that the blast would easily have been powerful enough to scatter debris all over the world).
As you can see, although the scatter plot is all over the place, the trend is that when large is relatively cheap, large out performs and when small is cheap it outperforms.