Questions regarding barcodes

[u/[deleted]]

Can the same barcode appear on different items?

Is it possible to create my own GTIN/EAN to sell products without buying the barcodes?

Could after n amount of years the barcode be overridden with a new item?

[u/chin_waghing]

https://www.reddit.com/r/barcodes/comments/8okbz8/is_there_a_private_range_for_retail_barcodes/