Which one of the following might shift the marginal cost curve from MC1 to MC2? 
Definitions:
United States
A country located primarily in North America, consisting of 50 states and a federal district, known for its large economy and diverse population.
Savings Rate
The proportion of disposable income that is saved by an individual or household instead of being spent.
Disposable Incomes
The financial sum available for households to spend and put aside for savings after income tax reductions.
Productivity Growth
An improvement in production effectiveness, characterized by the quantity of goods and services generated per unit of labor, capital, or other resources.
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