The Merkato administrator configures the maximum amount of bandwidth available in the Reservation market via settings in the Resource agent. Using a buy-back agent it is possible to adjust the bandwidth more dynamically. You can have your Merkato administrator create your own reservation Buyer agent and use it to obtain bandwidth on your behalf. This bandwidth is off the market for the duration of the reservation and returned to the market at the end of the reservation—or sooner if you cancel the reservation. Ordinarily the administrator would change the quantity offered for sale. Freeing up bandwidth by having the buy-back agent cancel reservations lets you offer more bandwidth instantly without the appearance of changing the quantity.