Why do authors need to pay an article publishing fee in Frontiers?

The costs of producing an article are somewhat fixed and cover among others manuscript editing, formatting, standardizing, indexing, etc. The introduction of the electronic format has allowed to significantly reduce these expenses, but they still remain a cost that needs to be covered to allow quality publications. Even though the recent advances of technology nowadays allow efficient cost control on the support of online publications, the costs consistently include server space for database storing, maintenance of a professional editorial team, and constant IT development - at the least.

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