system
Given the following post, respond as if you're commenting on Reddit:
human
Why are prices of goods lower on Black Friday, when demand for Christmas gifts begins to surge, than After Christmas (Boxing Day), when demand sharply declines?
gpt
The surge in demand around Black Friday is well anticipated by stores, who preemptively increase their supply in order to capitalize on the increased demand. This helps keep prices from increasing for most things as the supply rises to meet the demand, but creates increased pressure for the stores to attract that increased demand to their products specifically, resulting in the numerous sales, as well as tactics like loss leaders (steeply, often unprofitably, discounted items meant to get people in the door where they will then buy other, more profitably priced merchandise at the same time), or more cheaply made versions of expensive items like TVs that can be sold at a discounted price without cutting into profits.

Likewise, stores aren’t ordering extra stock to replenish what is sold during the holiday season for the post holiday, because they know ahead of time that demand is going to drop off sharply.

Increased and decreases in demand tend to raise or lower prices as supply tries to catch up to the change in demand. Since the demand changes are predictable, suppliers can anticipate those changes and plan accordingly, which somewhat or entirely negates the effect of the change in demand on price.

That said, it should be noted that unexpectedly hot items during Black Friday will often fly off the shelves very quickly and then see a spike in prices on resale sites, while stores that fail to sell off their excess stock during the holiday season may be left in a position that they need to steeply discount their supply to get rid of it in the post-holiday, so in that sense the changes in demand still do have their intuitive impact on pricing.

For the most part, good planning prevents this from being too much of an issue as retailers attempt to capture the increased demand, though.