Approximate Working capital calculation help?

Hello,

I was hoping someone could explain a rough WC approximation I came across during my internship. The analyst took the following as a rough proxy for WC:

Receipts from customers - payments made to suppliers - EBITDA

Could someone explain the intuition here please?

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Don't know that I agree with the methodology, but I think the idea is to capture:

(Cash coming in) - (Cash going out) - (Net change that flows through I/S), so that the WC that's being used in a calculation off of Net Income or EBITDA isn't "double-counting" what's already flowing through the I/S.

Again, think there are several level of assumptions that need to be made here for this to be a fair approach / I would probably not use this as an approximation.

 

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