Able takes a risk and creates a net, instead of fishing by hand. But will his risk pay off?
Charlie weaves Able a shirt in exchange for fish. Will this trade satisfy them both?
Able gives Baker a loan to build a fish trap, and Baker agrees to pay him back with interest. Can Baker pull off his proposed invention, or will Able lose?
Able uses Fishnotes (as opposed to actual, perishable fish) to purchase items from Charlie, starting the Fishnote system. Can Fishnotes be trusted? What else will the islanders' buy?
Able invests in more capital than he can employ with his own labor, leading him employ Frank. Will this be a fair arrangement, or will Frank suffer?
The trio begins to trade with the other islanders, and the competition puts Charlie out of business. She then founds a new business, based on her assessment of what sort of venture the market would support.
Charlie’s new hut is destroyed, forcing her to spend her hard-earned savings. The islanders get a sobering crash course in the effects on unseen consequences.
Betty acts as a middleman between investors (Charlie) and borrowers (Able), thus establishing a bank. Baker wants a loan, but is unwilling to pay the interest rate.
Charlie gets a loan so she can buy a machine to make jam. A storm comes and destroys her berry crop -- leaving the island with a problem of how she will be able to pay back the loan. How will the islanders' sacrifice for the greater good?
Able and Charlie convince the islanders to abandon the safety net system after they realize how it changes the behavior of Baker and others. What system will replace it, and who will repay the loans?