1. The link of customer satisfaction and profitability is related but non-linear.
2. Competition landscape might also impact the relationship shape between loyalty and customer satisfcation.
3. By reading promotion data and sales data, we can learn more details as below:
? Are customers borrowing from their future purchase?
? Which categories are substitutes/complements? Sales together or separately?
4. Data from sales end might miss a lot of info, such as customer behavior (mobile data can cover?)and psychographics (survey can cover? ) as well as the exact set of choices faced by the consumer at the time of decision. (Joint analysis can cover?) Besides, we can't make causal statement! (A cause B, or vice versa?)
