
by Tim Langeman
One of the most important concepts that MFTransparency addresses in all of our trainings and educational materials is the relationship between interest rates and loan size in microfinance, which we represent with a curve. This curve is even depicted as part of our logo. Throughout this web site, there are a series of graphs that plot this relationship using real data. In many cases, the graph trend line follows a curve in which the smaller-sized loans carry higher interest rates than larger-sized loans. As the loan size increases, interest rates tend to decrease.
Several posts on this blog have addressed the price curve in microfinance. In this post I will consider the relationship between price and quantity in other industries. What accounts for the curve, and is this type of curve present in industries other than microfinance?
As an experiment, I decided to visit a local grocery store and look for items that are sold in multiple package sizes. Two good examples are soft drinks and ice cream.
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