This included eight different NAS plant-based milk products offered on promotion (with one store offering only 7). Promoted foods were considered to be plant-based food products and alternatives which offered a direct substitute for animal-based products. Two approaches (difference-in-difference and ratio) were explored to assess how intervention stores compared to control before and during the intervention. A t-test was used to compare the units sold and revenue (in £) between control and intervention store groups. Given the discrepancy in sales between intervention and control stores (with sales in intervention stores approximately double those in control stores), the ratio method was prioritised.

Source: The Guardian June 21, 2024 11:34 UTC