I simply can't comprehend having that problem. If you have absolutely nothing to build before researching alphabet or currency, then there is something else you could be doing. You can always build settlers to expand. If you don't want to up your maintance and/or there is no more room to expand, then take the time to build workers. If you can't afford another unit, or you don't want to stop city growth, then build missionaries to spread your religion. If you don't have a religion, then build archers/axemen/swordmen (whatever you have the tech for) and disband your warriors. If you dont have copper/iron and dont have archery or if you dont have any warriors left, then start to build wonders. Then you at least get cash when the AI beats you to the wonder, and if you don't get beat to it then you get the wonder. If there are no wonders you can build in the city then this would be a good time to pump out units and invade a neighbor. If you don't wish to invade a neighbor, this situation should rarely happen and creating then disbanding shouldn't be too bad. If this situation does happen often to you then you simply need to learn how to tech faster, because you shouldn't be able to run out of things to build, especially with chopping weakened. Spam those cottages.