To expand on Job's excellent answer, your particular boosted goods are chosen by the game when you first create an account. You can tell which they are by clicking on your main hall and looking for the highlighted ones. The relics tab on the main hall will tell you how much of a boost you currently have if you've reached them via research as well. You can also find which boosted goods you have by going to the world view and looking at the goods shown on the straight north, southeast and southwest provinces surrounding your city, or 12, 5, and 7 o'clock if you think of it as a clock face.