Two eggs, one brown and one white

3. Check pack sizes match
Watch out for alternative products in smaller packs – of course they’ll be cheaper! Be sure to adjust the price accordingly.

4. Beware of loss leader pricing
Supermarkets do it, so can commercial suppliers. Watch out for the flagging of a number of loss leader products, which may be discounted for a limited period before returning to a higher price after that.

5. Confirm price lists are up to date
Check that pricing is current – accidental use of outdated prices could give an over-optimistic impression of greater savings.

6. Use a weighted shopping basket
Benchmarking should not simply calculate savings on unit prices, it should take account of your product volumes over the period being compared.

7. Get the volume weighting right
Just as unit prices won’t give a real world comparison, so can a skewed basket inflate savings. Best check product volumes match your use, over the period under consideration.

8. Check for hidden management fees
Always double check for hidden extras such as management fees or delivery charges. These can be used to claw back headline savings.