Online derivative calculator:

https://www.derivative-calculator.net

https://www.symbolab.com/solver/derivative-calculator

General directories and indexes of economic information are:

The Library of Economic and Liberty: https://www.econlib.org/

Market conditions and prices for coffee are found in:

http://www.ico.org/coffee_prices.asp

For agricultural policies in OECD countries, see:

http://www.oecd.org/dataoecd/34/35/43247947.pdf

Information on tax rates in the various states of the United States is found in:

http://www.taxadmin.org/fta/rate/tax_stru.html

For rent control, see:

http://meganmcardle.theatlantic.com/archives/2009/10/

rethinking_rent_control.php

https://www1.nyc.gov/site/rentguidelinesboard/resources/rent-stabilized-building-lists.page

http://www.econlib.org/library/Enc/RentControl.html

Data on the International transactions of the United States are found in:

Bureau of Economic Analysis web site: http://bea.gov/ and clicking "international data."

Federal Reserve Bank of St. Louis: https://fred.stlouisfed.org/

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