How to think about CAC for business with low S&M, acquiring customers thru M&A?

How does one think about CAC (as well as go about calculating it) for a business with near $0 s&m spend? The company acquired customers by acquiring adjacent businesses.

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How to think about CAC for business with low S&M, acquiring customers thru M&A?

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How to think about CAC for business with low S&M, acquiring customers thru M&A?

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