Hello, Pvunderink—and welcome to English Forums. Pvunderink Are 'that' and 'which' interchangeable? Sometimes.
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PvunderinkAre 'that' and 'which' interchangeable?Sometimes.
Pvunderink I also wasn't sure if I missed a comma,Actually, the one after 'externalities' is not required either, but then the sentence makes for quite a long breath for the reader.