In Topsort, campaign budgets can have a “carryover” feature that allows for
potential overspending on a given day to compensate for previous
underspending. This mechanism helps campaigns utilize their full budget over
time.
How Budget Carryover Works
If a campaign spends less than its set daily budget on previous days, the
unspent amount accumulates as “unused budget”. This can happen due to factors
like low traffic or insufficient vendor funds. On a subsequent day, if
conditions improve and funds are available, the campaign is allowed to spend
up to double (2x) its usual daily budget to make up for the accumulated unused
budget.
For example, if a campaign has a daily budget of $100 but only spends $50 on
Day 1, it will have $50 of unused budget carried over. On Day 2, if there’s
more traffic, the campaign could potentially spend up to $150 ($100 daily
budget + $50 carryover).
Campaign Activation and Carryover
Even if a vendor’s account has no funds when a campaign is initially
activated, the system still considers the campaign “active.” During this
period, the campaign is technically accumulating unused budget because no
spending is occurring. Once funds are added to the vendor’s account, the
campaign could spend up to 2x its daily budget, as it catches up on the
previously underspent day.
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