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I tried to follow the instructions for adding a feedback loop to the tutorial Customer.mdl model, using Active Initial, but the very simple model based on the initial tutorial won't run. I cannot see how it differs from the ACTIVE INITIAL.mdl model. Can anyone help?

this is what I tried to add. Syntax is ok, but model complains about the initialization.

This is not an initialization problem; it's a dynamic problem. Your loop from CompetitionSteals -> Customer Acquisition Rate -> Hardware Sales -> DEC Sales would have to contain a stock to work. I think you need to rethink that part.