When the demand slacks or new routes are launched, airlines lower the prices of premium cabins. The low business fares are also very common and are spotted by travelers on fare history as business fares are priced at a range of USD 1,800–2,200 on transatlantic travel, which should be above USD 3,800. This kind of pricing is usually associated with departures during the middle of the week and seasonal readjustment of capacity in place of promotional marketing campaigns.
https://askforairlines.com/blog/low-business-fares/