500 Series Stacking Question

I'm sure this is a silly question, but I wasn't able to find a definitive answer elsewhere.
If I have two stack cables connected between two SG500-series switches, it my effective link speed between the two devices 2000Mbps in each direction, or does one of the stack cables sit idle waiting for a failure?

Thanks.  As a followup, if I had a stack connection and a trunk connection between the two switches, then would my effective link speed between the two be 2000Mbps, or would the stack link be only used for management in that case?  I'm trying to see if I can increase my bandwidth between the two switches using only two cables already in place.

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