To make Chuck's Seahorse Farm work, I invent an automatic zooplankton dispenser (the Feedbag-O-Matic), and I get a patent for it.

To make Chuck's Seahorse Farm work, I invent an automatic zooplankton dispenser (the Feedbag-O-Matic), and I get a patent for it. While I have to compete with all those fishermen in Southeast Asia to sell my crop, I have a monopoly on my little gizmo, and I behave accordingly, selling it to home aquariums and other aquacultural establishments. The annual demand for this machine can be expressed as QD = 4000 - 50*P, and my costs of producing the Feedbag-O-Matic are TC = (1/200)*q^2 + 20q + 6000. (This yields MC = (1/100)*q + 20.)