Tsk Tsk... haven't we already discussed how Spain is trying to legalize or at least decriminalize drugs? Anywho... the pyramid I am referring too is a pyramid, and this is why.
1. Starting at the top and going down are the richest, and there are few of them. These are the bourgeois, or the people that own the means of production.
2. Starting from the bottom and going up are the proletarians, those who do not own the means of production, and thus must sell their wage labor to the bourgeois to survive. There is a bit of a grey area in the middle because the ownership of the means of production might be owned by many people, and although they may own the means of production, they are not as well of as those who own the sole means of production in a particular field, so they are in the middle, but are still bourgeois.
3. Who ever said that a pyramid means that the lower part occupy the majority of the population? This shows how ignorant you are. Say we have a pyramid with 20 levels, the top 3 levels are the upper class, the bottom three levels are the poor and the middle 7 levels are the middle class. So, the population is represented equally, but it still shows the pyramid effect of capitalism. For every few at the top, there is a multitude below them supporting them, working in their factories and buying their products.
For you visual learners: Pretend this is 1/2 of the pyramid. (triangle actually, being 2d and all)
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Upper Class
Middle Class
Lower Class
Get it now?