With the new economic system, is there a good reason, of the thematic, gameplay or technological variety, to keep "pops" around as discrete units? It seems to me that it would make solving the pop growth issues easier if population was just a number, and fractions of population could work a job. It would also eliminate the growth spikes and presumably work well with migration and unemployment. The obvious question is, of course, how deeply the pop system is build into the game.