The slope of the spending plan constraint usually shows the opportunity price of the good that is within the horizontal axis. If Charlie has to give up lots of burgers to get just one bus ticket, then the slope will be steeper, simply because The chance Value is larger. https://financefeeds.com/blockdag-review-%e2%ad%90%e2%ad%90%e2%ad%90%e2%ad%90%e2%ad%90-exploring-the-future-of-copyright-mining-with-5-questions/