For the following reaction, identify the Lewis acid. 
Definitions:
Consumer Surplus
The difference in consumer's payment expectation versus their actual expenditure on a good or service.
Demand Curve
A graph representing the relationship between the price of a good and the amount consumers are willing and able to purchase at various prices.
Producer Surplus
The difference between the actual price at which a producer sells a product and the minimum price they would be willing to accept, indicating producer gain.
Consumer Surplus
The difference between the total amount that consumers are willing and able to pay for a good or service and the total amount they actually do pay.
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