My problem in playing at Prince level is how fast to expand without crashing the economy. My adversaries always seem to have built more cities than me. I build 2 cottages in every city and work sea tiles as well but my gold to research rate is always dropping. Even though I have space to expand, if I try to catch up with the number of cities, my economy collapses. It takes 40 turns to grow a village into a town, just to get 1 gold more and by this time the city maintenance and inflation increases faster, I reckon. How do you cope?