Real estate is durable. A building can last for decades or even centuries, and the land underneath it is practically indestructible. Because of this, real estate markets are modeled as a stock/flow market. About 98% of supply consists of the stock of existing houses, while about  consists of the flow of new development.

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Every piece of real estate is unique, in terms of its location, in terms of the building, and in terms of its financing. This makes pricing difficult, increases search costs, creates information asymmetry and greatly restricts substitutability. To get around this problem, economists beginning with Muth  define supply in terms of service units, that is, any physical unit can be deconstructed into the services that it provides.

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If any buyer's broker (or any of his/her agents) brings the buyer for the property, the buyer's broker would typically be compensated with a co-op commission coming from the total offered to the listing broker, often about half of the full commission from the seller. If an agent or salesperson working for the buyer's broker brings the buyer for the property, then the buyer's broker would commonly compensate his agent with a fraction of the co-op commission, again as determined in a separate agreement. A discount brokerage may offer a reduced commission in the event no other brokerage firm is involved and no co-op commission is paid out.If there is no co-commission to pay to another brokerage, the listing brokerage receives the full amount of the commission minus any other types of expenses.

Real estate commissions are becoming a point of controversy. Home values in many areas have quadrupled over the past 20 years. This may be contributing to the increased number of licensed agents and growing competition between them. The number of real estate agents in areas tends to rise when home values do, and the productivity of existing agents goes down.Another controversy exists around how commissions paid to real estate agents are disclosed to buyers and the effect additional seller incentives may have on the negotiation process and final purchase price.

If a listing agent sells a property for any amount above the listed price, he in turn will make additional income. In theory, this will motivate him/her to get top dollar price for his client, the seller. However, if the agent representing the buyer attempts to obtain a lower sales price for his client, then he/she would make a lower commission. Thus, it could be considered to be in the agent's best interest to advise his client to purchase the property at a higher price.In practical terms, there is rarely a great enough difference between the listing asking price and the negotiated selling price to make a significant difference between the commissions generated on each side, and certainly hardly enough to justify an agent failing in his fiduciary duty to obtain the best terms for his/her client.Another potential conflict of interest exists when a listing agent in a very active real estate market has incentive to sell properties quickly at unnecessarily low prices in order to benefit from a high volume of sales.

A person may attend a pre-license course often 60 actual hours and be tested by the state for a real estate agent's license. Upon passing, the new licensee must place their license with an established real estate firm, managed by a broker. Requirements vary by state but after some period of time working as an agent, one may return to the classroom and test to become a broker. Brokers may manage or own firms. Each branch office of a larger real estate firm must be managed by a broker.

States issue licenses for a multi year period and require real estate agents and brokers to complete continuing education prior to renewing their licenses. Many states recognize licenses from other states and issue licenses upon request to existing agents and firms upon request without additional education or testing however the license must be granted before real estate service is provided in the state.