> For the complete documentation index, see [llms.txt](https://support.happydemics.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://support.happydemics.com/launch/survey-customisation/how-to-add-an-audience-boost.md). # How to add an audience boost? When you launch a brand lift, you have the option to add an audience boost. This not only gives you a larger number of respondents but also makes it easier to analyze your results and gain insights into specific sub-targets.
**You have two options:** * **Double your sample size :** for an additional cost of €1,000, you can double your sample from 250 to 500 respondents who recall your campaign. * This reduces the average margin of error by 30%, making your results more accurate and reliable. * Doubling your sample also improves your chances of gathering meaningful insights from your most-represented sub-targets. For example, if your core target makes up over 30% of the total audience, you’ll have around 90 respondents in your target group. * **Increase your sample size fourfold :** for an additional €2,000, you can quadruple your sample—reaching 1,000 respondents who recall your campaign. * This halves the average error margin, doubling the reliability of your results. * With a larger sample, you can also gather valuable insights into less-represented sub-targets. For example, if your main target group is over 15% of the total audience, you’ll have around 250 respondents in your target. * A bigger sample also allows for more in-depth analyses—you can explore response details, cross-reference indicators, and drill down to more granular insights. **Good to know:** The audience boost is applied per media. So, if your brand lift covers three media, the additional cost will be multiplied by three. *When you select your target, we’ll recommend the right boost to help you achieve your research goals.*