Apparently the campaign to aid Dutch local bookstores worked! Over two hundred writers called on their social media followers to buy books online from their favorite local bookstores during lockdown rather than from the large online retailers.
Dutch news website nu.nl reports that as a result, sales volumes at these stores have almost doubled: https://www.nu.nl/cultuur-overig/6102732/lokale-boekhandels-zien-omzet-bijna-verdubbelen-na-oproep.html
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See Hollis’ video on Instagram as part of the campaign: