A spike online, a queue at the till
Both sides of this pair announce their sales, so neither waits.
TikTok Shop and Clover both tell us about a sale the moment it happens, and each is corrected from the other in about a second. A video that moves thirty units in an hour walks the register’s count down one sale at a time, and a busy Saturday at the counter does the same to the TikTok listing.
There’s no polling window here to plan safety stock around: the count both sides show during the rush is the real one.