The FRED graph above shows the prices of a dozen eggs and a pound of chicken breast. (A previous post graphed price changes for those items.)
Egg prices have been in the news for their stark increases recently. But chicken breast prices not so much, as those prices have been relatively stable. Why the difference in price patterns for products from the same animal?
Economic theory would tell you this: If two goods are substitutes, their prices track each other well, as one can be replaced by the other if one becomes relatively more expensive. But eggs and chicken meat are not substitutes in either production or consumption.
Are they complements? That would mean that, if you eat one, you necessarily eat the other. Only few recipes call for both eggs and chicken meat, so they aren’t complements in consumption. But they could be complements in production: An egg-laying hen can also provide chicken meat. In a case such as this, excess demand for one over the other can lead to a divergence of prices.
But that is not the explanation either. Nowadays, chickens are very specialized. “Broilers” grow in a few weeks before slaughter, while laying hens live for years. The latter have more opportunity to catch diseases, and the current avian flu epidemic is affecting them much more than broilers, which can be replaced quickly. Thus, chicken breast prices are much less affected, if at all, by current circumstances.
How this graph was created: Search FRED for “chicken breast” and click on the first choice. Click on “Edit Graph,” then open the “Add Line” tab, and search for/select the series for eggs. Finally, start the graph in 2006.
Suggested by Christian Zimmermann.