money games
A money game is any program which
people participate in for the sole purpose of making a profit,
where the only apparent source of such profit is from other
participants in the program.
This is generally accomplished by bringing in new participants,
thus requiring impossibly-increasing numbers of participants,
and therefore fitting the definition of a pyramid scheme.
(Compare this to a Ponzi scheme in which the participants
are typically told the profit is coming from some investment;
it's only apparent to the promoter that all profits come from
participants.)
Law enforcement agencies love money games, because the issues
are usually very clear cut, and successful prosecutions are far
more likely;
when mlm's operate as pyramid schemes,
on the other hand, it is necessary to demonstrate that
any buying or selling of product is incidental to
the operation of the program.
Here are a number of programs that appear to fit in this category: