Final answer:
The most influential factor for a dramatic change in supply is a change in the price of raw materials used in production. This affects the cost of production and thus the quantity supplied. Factors like changes in government policy and expectations about future prices also impact supply but may not have as immediate an effect.
Step-by-step explanation:
The factor that would most likely result in a dramatic change in supply is a change in the price of raw materials used in the production process.
Explanation: The cost of inputs has a direct effect on the cost of production. If the raw materials used in the production process become more expensive, the overall cost of producing goods or services increases. This scenario can reduce the quantity that businesses are willing to offer at a given price, as higher production costs decrease profit margins. Factors such as changes in government policy or producers' price expectations also play a significant role in altering supply, but the cost of inputs such as raw materials often has the most immediate and substantial impact on supply levels.
Summing up, fluctuations in the price of raw materials can lead to significant adjustments in the production process, which may result in companies either reducing the quantity supplied or increasing the price to maintain profitability, or possibly both.