progress and the natural selection between good and bad ideas

so in technology (where I work) bad ideas are usually (at least eventually) beaten out
by better ideas - so we see "progress". But in philosophy, there is no way to kill a bad idea - there's no reason we assign it a cost that means that each new person who rediscovers it can tell how much worse an idea it is than another

hence bad ideas, li-ke Free Market Economics, and Religion, are very hard to eliminate
compared with horsedrawn carriages and sackcloth shirts.

how is that, pray?