Every brand in your category is about to bid against you for the same attention, and most of them have been told to be aggressive. Acquisition costs rise in November. That is not a failure of your media buying, it is arithmetic, and it happens whether or not you have planned for it.
The number to agree now
Your margin floor is the contribution per order below which you stop spending. Not a return target reported by an ad platform, for the reasons we set out in July, but a margin figure in dollars that survives a conversation with whoever watches the bank account.
Agree it now, write it down, and decide in advance who is allowed to override it and on what evidence. In our experience that should be one person, usually the founder, and the only acceptable reason is a cash one.
Why October rather than November
Because in three weeks you will be looking at the busiest dashboard of your year. Volume is up, revenue is up, and every instinct says push. Decisions made in that state are not really decisions, they are reactions, and they are reliably worse than the same decision made calmly a month earlier.
A floor agreed in advance turns a hard judgement call into a simple check. The number is either above the line or it is not.
What it protects you from
The brands that come out of peak season in trouble are rarely the ones that sold too little. They are the ones that sold a great deal at a contribution they never actually calculated, and only discovered in January when the invoices and the ad spend landed in the same month.
A floor does not cap your growth. It caps your capacity to buy revenue you cannot afford.