Marketing is just a capital allocation problem.

Somehow we all accept that in every other part of the business. Capex gets a model. Headcount gets a plan. Even the CFO’s “strategic initiatives” get a spreadsheet and a quiet prayer.

Marketing gets vibes.

That’s why I call the right theory "Investment Marketing".

Marketing is an investment vehicle. Full stop. It has an entry price, a risk profile, a time horizon, and an expected return. If you can’t tell me the expected return and the payback period, you’re not “building brand” you’re just buying feelings with someone else’s money.

And no, “we got a lot of impressions” isn’t a return. It’s a receipt.

Here’s the bit people in PE should love: marketing budgets have fallen to 7.7% of company revenue (down from 9.1% the year before). The era of throwing money at it and hoping is over. 

So treat it like capital:
Set a hurdle rate. Define the payback window. Underwrite the downside. Protect the compounding channels.

Email is the most obvious example. It’s boring, unsexy, and tends to print money when you do it properly. Average ROI gets quoted at $36 back for every $1 spent. 
Meanwhile lots of teams keep chasing shiny objects because it “feels modern”.

Then you get the other classic move: panic cutting spend when numbers wobble. Nielsen’s work shows brands lose around 2% of future revenue for every quarter they stop advertising. 
Congratulations, you hit this quarter’s EBITDA and quietly nuked next year.

The kicker is we already know how to fix this. Better measurement and incrementality discipline can drive 20% to 40% improvement in spend efficiency. 
So it’s not a mystery. It’s laziness. Or cowardice. Usually both.

Investment Marketing is simple:
Know what you’re buying
Know what return you expect
Know when you’ll get paid back
Know what you’ll kill if it doesn’t

Everything else is just theatre with nicer fonts.