How to fix the missing GTIN value error in Google Merchant Center?

Hi Emmanuel,

Thank you for your contribution over the years especially when it comes to data feed. You are definitely the go-to person and have heard great reviews about your app.

I have a question for you - if we are the manufacturer and only seller of our product, does adding GTIN increase performance/visibility with Google Shopping? I understand it can hinder performance if multiple sellers are selling the same product eg. a Nike shoe.

I’m just wondering how much difference would it make in relation to Google ads, will it increase abs.top, impression share, reduce cpc etc?

I know you work with many clients and was wondering if you’ve seen the results of adding GTIN.

Thank you in advance Emmanuel!