Expediters gauge their market every day in several ways.
At the end of each load, they gauge the market to determine where the next load is most likey to come from. They then wait where they are for freight or reposition themselves in accordance with their observations. In so doing they consider time of day, day of week, time of month, and even time of year. As with a stock, they may also consider information from the rumor mill, opinions of other investors (drivers), and even gut feeling.
Before each load, expediters gauge the area where the load delivers and make that information part of their load accept or decline decision.
Also before each load, they gauge their known costs per mile against the pay per mile in the offer. In so doing, they maintain an ongoing awareness of things like fuel costs and fuel surcharges.
When choosing a carrier, they gauge their perferences against known carrier characteristics and so align themselves.
When choosing a truck type they gauge the B, C, CR, D, DR, E and ER opportunities, factor those in with other preferences and desires and make their truck-type decision.
When taking time off, they gauge the freight cycle and try to time their off time with slow freight times.
While it is not an apples to apples comparison, there are a number of procedural and motivational similarities between making a buy/sell decision on a stock in the stock market, and making a yes/no decision on a carrier, truck type, or run offer in the expediting market.
In both cases you invest in something (a stock or a truck) and seek to make the best decisions you can to maximize the return on that asset.