The supply curve for potatoes can shift to the right because of an increase in the supply. The supply for a product may arise because of several reasons such as improvement in technology or reduction in the cost of production.
In the given options, the use of new harvester that allows the farmer to bring in ripe potatoes at twice the speed than earlier will help the farmer to increase supply. This will further cause the supply curve to move to the right.
Answer: The correct answer is "B. A new resource".
Explanation: The discovery of Surlyn de DuPont, being a new material with multiple potential uses, which could be applied to the manufacture of many products would clearly fall under the category "a new resource".
