It used to be that the + and - buttons to buy and sell resources were next to each other. But now we have to move our mouse back and forth across the number display to adjust our resources.
I think the price display should be clickable as well. Buying and selling can meet in the middle of the resource display.
I made a picture to explain myself. I can't guarantee that I spent a lot of time making it, but I can guarantee that I used one of the most famous image-editing software in the world to do it. MS Paint
