heterogeneous market

The controls market at that time was a very heterogeneous market with different types of programming methods for many different PLCs.

Eastern Europe has been the focus of a great deal of attention since the near-impenetrable Eastern Bloc unfolded into a series of heterogeneous markets.

What does happen historically is that integrated songs become gradually less common through the course of Elvis's career, while the song-types tend to diverge, as the relatively small, well-defined audience of the Sun days gives way to a large, heterogeneous market demanding different types for different sub-sections.