Advertising effectiveness barely changed after Covid

    -1%

    ROI per year

    -7%

    spend change

    53

    matched brands

    Comparing 53 brands with like-for-like econometrics before Covid (2018-Q1 2020) and after (2022-2023), average advertising ROI fell about 1% a year while spend fell 7%. That is gradual drift, not a structural break.