It's like you buy and sell stuff like you buy [ I don't know what the buy button does... ] then you sell them. And you buy when the line is low and sell when the line is high [ it's kinda like a line graph ]. Then when the thing closes, it tells you how much G [gold] you earned. Also your goal is first 10 million G. And the people you pass by is a specialist [the people who predict if it goes up