Paid Social AdvertisingBudgets, bidding, tracking and consent · Lesson 7 of 17

Budgets, auctions and bid strategies

Article · 14 min · 8 min lecture

Video lecture

Budgets, auctions and bidding: giving the algorithm room to learn

11 chapters · about 8 min · full transcript

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Chapter 1 of 11

Budgets, auctions and bidding

  • How the auction works
  • Budget types
  • The learning phase
  • Bid strategies
  • Scaling and seasonality

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Chapters

How the ad auction works (simplified)

Social platforms sell ad space through auctions. The winner is not simply the highest bidder. Meta, for example, describes a total value that combines:

  • Bid: what the advertiser is willing to pay for the result.
  • Estimated action rate: how likely the person is to take the optimisation action.
  • Ad quality / relevance: based on feedback and quality signals.

Other platforms use similar logic. This means a relevant, engaging ad can win auctions at a lower cost than a poor ad with a higher bid. Good creative literally lowers your prices.

Budget types

  • Daily budget: average spend per day. Platforms may spend somewhat more on some days and less on others while keeping close to the average over a week.
  • Lifetime budget: total spend over a fixed period; useful for launches and time-bound promotions like Eid or Black Friday, and required for some scheduling options.
  • Campaign-level budget (Meta's Advantage campaign budget, TikTok's campaign budget optimisation): the platform distributes budget across ad sets towards the best opportunities.
  • Ad set-level budget: you control spend per ad set. Useful for strict tests or when you must guarantee spend on specific audiences.

The learning phase

After launch or a significant edit, delivery systems go through a learning phase while they explore who responds. Performance is less stable during this time. Meta, for example, indicates an ad set usually needs around 50 optimisation events within a week after the last significant edit to exit learning.

Practical implications:

  • Budget each ad set so it can realistically generate enough optimisation events. If your CPA is around $20 and you need about 50 events a week, that is roughly $1,000 a week or about $140 a day. If that is unrealistic, optimise for a higher-volume event or consolidate ad sets.
  • Avoid frequent significant edits (budget jumps, targeting changes, new creative in the same ad set) that reset learning.
  • When scaling, increase budgets gradually rather than doubling overnight, or duplicate winners into new campaigns.

Bid strategies

Strategy (Meta naming; others similar)How it worksWhen to use
Highest volume / lowest cost (TikTok: Maximum delivery)Spends the budget to get as many results as possibleDefault; new accounts; learning what CPA is achievable
Cost per result goal (cost cap)Aims to keep average cost around your targetWhen you know your target CPA and can accept lower volume
ROAS goal (minimum ROAS)Aims for a minimum return on value-optimised campaignsE-commerce with reliable purchase value tracking
Bid capSets a maximum bid in each auctionAdvanced users who understand auction dynamics

LinkedIn offers options such as maximum delivery, cost cap and manual bidding. Start with automated "highest volume" bidding until you have data, then add controls if costs drift above your break-even.

Budget allocation across the funnel

A common approach for a growing e-commerce brand:

  • Majority to prospecting (new people), because retargeting pools depend on new traffic.
  • Smaller share to retargeting, sized to the audience (a small audience cannot absorb a big budget without extreme frequency).
  • Ring-fenced test budget for new creative.

Seasonality

CPMs often rise during peak periods (Ramadan and Eid in Muslim-majority markets, Black Friday/White Friday, Christmas in the UK and US, 11.11 in some markets) because more advertisers compete. Plan creative and budgets early, warm up audiences before the peak and set expectations with clients that costs can increase.

Worked example (illustrative)

A Pakistani electronics store's target CPA is PKR 2,000. It currently runs eight ad sets, each spending PKR 3,000 per day and getting one or two purchases daily. None exits learning. The team consolidates into two ad sets with PKR 12,000 daily each on campaign budget, broad targeting and six creatives each. With more events per ad set, delivery stabilises and CPA becomes more predictable.

Common mistakes

  • Many small ad sets that never exit learning.
  • Big, sudden budget changes that reset learning.
  • Setting cost caps below realistic levels, causing little or no delivery.
  • Ignoring seasonal CPM changes.

Hands-on: a learning-budget and structure calculator

In Google Sheets (illustrative inputs):

RowLabelValue / formula
2Target CPA25
3Optimisation events needed per ad set per week50
4Planned monthly budget for this platform12000
5Weekly budget needed per ad set=B2*B3
6Weekly budget available=B4*12/52
7Max ad sets that can exit learning=ROUNDDOWN(B6/B5,0)
8Daily budget per ad set=ROUND(B5/7,0)

With a USD 25 target CPA and USD 12,000 a month, you can support about two ad sets optimising for purchase (each needs about USD 1,250 a week, about USD 179 a day). If row 7 shows zero or one, consolidate, use campaign budget, or move to a higher-volume event temporarily.

Scaling without resetting learning

  • Step increases: raise budgets by roughly 20–30% at a time, then wait a few days before the next step.
  • Duplicate to scale when you need a big jump, leaving the original running.
  • Scale the campaign, not a single ad: with campaign budgets, the platform shifts spend to what works.
  • Watch marginal returns: if CPA rises faster than spend, you have reached the point where extra budget buys less – see the scaling lesson.

Worked example 2: planning a Ramadan and Eid push in the Gulf

A Jeddah perfume brand plans a four-week push:

  • Two weeks before Ramadan: build creative and warm up prospecting at normal budgets so the campaign exits learning before costs rise.
  • Ramadan (evenings matter): a lifetime budget with ad scheduling weighted towards evenings and post-iftar hours (lifetime budgets are required for scheduling on some platforms). Expect higher CPMs as competition rises.
  • Last ten days and Eid: shift budget to gift bundles and delivery-deadline messages; increase retargeting as warm audiences grow.
  • Rules agreed up front: keep the ROAS goal loose early; tighten only if delivery is healthy; pause bundles that sell out.

How to measure success

  • Each ad set records enough optimisation events to exit learning (check each platform's delivery status column).
  • Budget changes are logged with date and size, and none were made during a test's minimum run.
  • CPA holds within your target range as budget steps up; when it does not, you know your current efficient ceiling.

Key takeaways

  • Auctions combine bid, estimated action rate and ad quality, so good creative lowers costs.
  • Choose daily or lifetime budgets and campaign- or ad-set-level budgets deliberately.
  • Budget for enough optimisation events to exit learning; avoid frequent significant edits.
  • Start with automated highest-volume bidding, then add cost or ROAS goals once you know your numbers.

Check your understanding

Quick questions to lock in the lesson. They don’t count towards your certificate.

  1. Your target CPA is $25 and the platform suggests about 50 optimisation events a week to exit learning. Roughly what weekly budget does one ad set need?
  2. Why can a relevant ad win an auction with a lower bid?
  3. When should you consider a cost per result goal (cost cap)?

Put it into practice

Calculate the weekly budget each of your ad sets needs to reach about 50 optimisation events at your target CPA. If it is unrealistic, redesign the structure or optimisation event.

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