Compare with potatoes, which keep about as well an onions, and are farmed in the same areas. Look at onions and potatoes over a 5-year time span (because the default all-data time span is silly for this). It doesn't give enough control of the Y axis to make the comparison easy - for potatoes it shows me Y=40-320, for a range of 280; for onions it shows me Y=120-440, for a range of 320. This means that potatoes are more "zoomed in" and it's graph will exaggerate volatility relative to onions, but qualitatively, I'd say the potato graph looks smother just the same. This is exactly what economic theory says a futures market should do to the price.

> [A] trading facility that— (A) permits trading— (i) by or on behalf of a person that is not an eligible contract participant; or (ii) by persons other than on a principal-to-principal basis; or (B) has adopted (directly or through another nongovernmental entity) rules that— (i) govern the conduct of participants, other than rules that govern the submission of orders or execution of transactions on the trading facility; and (ii) include disciplinary sanctions other than the exclusion of participants from trading.

And 7 USC § 1a(51)(A) defines a "trading facility" as

> [A] person or group of persons that constitutes, maintains, or provides a physical or electronic facility or system in which multiple participants have the ability to execute or trade agreements, contracts, or transactions— (i) by accepting bids or offers made by other participants that are open to multiple participants in the facility or system; or (ii) through the interaction of multiple bids or multiple offers within a system with a pre-determined non-discretionary automated trade matching and execution algorithm.

(7 USC § 1a(51)(B) then follows with some exceptions to that definition.)

In short—an "organized exchange" is defined as a type of "trading facility". To count as a trading facility", whether of the "organized exchange" type or not, you must either accept bids or offers from other participants yourself or else deterministically match and execute those bids and offers.

As distinguished from an exchange, where the exchange intermediates and becomes a middle party "simultaneously" to both sides.

The market dynamics are pretty different between broker dealers and exchanges. For instance a /ticker/ as a concept makes sense only with an exchange.

The exchanges basically pick up only the contracts or goods with the most volume and standardized & predictable goods.

To trade more exotic or niche things basically you have to find your own counterparty, versus the exchange acts as an "typical" buyer and seller to each side (assuming there is anyone there at all to participate on each side... giving rise to the concept of market makers who undertake to do just that, i.e., to be ready to trade either side at any time in a certain good).