Which one of the following might shift the marginal cost curve from MC1 to MC2? 
Definitions:
Introduction Stage
The first phase of a product life cycle, characterized by initial product launch, slow sales growth, and marketing efforts to build awareness.
Introduction Stage
The initial phase of a product's life cycle, characterized by low sales growth as the product is being introduced to the market.
Decline Stage
The phase in a product's life cycle characterized by a decrease in sales and profitability, indicating the product is nearing the end of its market life.
Maturity Stage
A phase in the product life cycle where growth is diminished, and sales are steady or declining.
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