Market Service Agent¶
The Market Service Agent implements a variation of a double-blind auction, in which each market participant bids to buy or sell a commodity for a given price.
In contrast to other common implementations, participants do not bid single price-quantity pairs. Instead, they bid a price-quantity curve, or “flexibility curve” into their respective markets. Market participants may be both buyers in one market and sellers in another.
Settling of the market is a “single shot” process that begins with bidding that progresses from the bottom up and concludes with a clearing of the markets from the top down. This is termed “single shot” because there is no iteration required to find the clearing price or quantity at any level of the market structure.
Once the market has cleared, the process begins again for the next market interval, and new bids are submitted based on the updated states of the agents.
The Market Service Agent requires the Transitions (version 0.6.9) and NumPy (version 1.15.4) packages. These packages can be installed in an activated environment with:
pip install transitions==0.6.9 pip install numpy==1.15.4
The MarketServiceAgent is driven by the Director. The Director drives the MarketServiceAgent through a timed loop. The Director has just a few parameters that are configured by default with adequate values. They are:
The market_period with a default value of 5 minutes
The reservation_delay with a default value of 0 minutes
The offer_delay with a default value of 2 minutes
The timing loop works as follows:
The market period begins.
A request for reservations is published after the reservation delay.
A request for offers/bids is published after the offer delay.
The aggregate demand curve is published as soon all the buy offers are completed for the market.
The aggregate supply curve is published as soon all the sell offers are completed for the market.
The cleared price is published as soon as all bids have been received.
Error messages are published when discovered and usually occur at the end of one of the delays.
The cycle repeats.
How to Use the MarketServiceAgent¶
A given agent participates in one or more markets by inheriting from the
base MarketAgent. The base MarketAgent handles all of the communication between the
agent and the MarketServiceAgent. The agent only needs to join each market with the
method and then respond to the appropriate callback methods. The callback methods are described at the