Tecumseh1
Prince
But that's only because people choose to play running science high. I can run long periods of expansion because of markets. Again, the hammer argument is a red herring, because library's while 60% of the hammers of a market, are Super expensive when considering the era you build them. If you only build libraries when you have access to build markets, it's a different story, but most people build them early at the cost of hammers when they are not as abundant without chopping trees.
Interesting I haven't heard much discussion of this approach in the forums. Are you doing HA or construction rushes pretty often so your economy dies and you recover via currency/markets until engineering or something?