The bid-rent curve has a negative slope because the activities balance the bid-rent with the cost of transportation to the point of attraction. Farther distances require greater transportation cost and thus reduce the amount of rent that can be paid. The bid-rent curve indicates why rents, and by inference land values, tend to be higher near central locations. Â« Better Business Bureau | big business Â». Permalink: http://glossary.econguru.com/economic-term/bid-rent+curve.
Recursion in computer programming is exemplified when a function is defined in terms of simpler, often smaller versions of itself. The solution to the problem is then devised by combining the solutions obtained from the simpler versions of the problem.
Recursion is a function that calls itself. How to use it, when to use it and how to avoid bad design are important to know, which requires you to try it out for yourself, and understand what happens. The most important thing you need to know is to be very careful to not get a loop that never ends.