The average power supplied to the circuit shown passes through a maximum when which one of the following is increased continuously from a very low to a very high value? 
Definitions:
Bid-Asked Spread
The difference between the highest price a buyer is willing to pay for an asset and the lowest price a seller is willing to accept.
Broker's Commissions
Fees charged by a broker for executing transactions or providing specialized services.
Price Concessions
Discounts or adjustments in the price of a good, service, or security, often granted to finalize a deal.
Effective Spread
The measure of the actual cost of a trading transaction, calculated as the difference between the executed trade price and the midpoint of the best bid and ask quotes at the time of the trade.
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