Supermarket deception

Talk format 

1. It is entirely interactive and the audience can ask questions and make comment at any time.  The progression to a fresh aspect means that more info is put forward.  I then ask questions about it and invite comment.
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3. Ideally, there will be a very large screen and I will outline an idea.  One follows, but organisers can shape the talk to their requirements
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5. There will be a table, chopping board, knives etc for dissecting, say, a lamb cutlet.  
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7. The unusable proportion  is demonstrated (70% - see Panel 12 here).  
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9. The cost of the cutlet is now calculated re the usable part.  
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11. The resulting cost is compared with the the original cost per kilogram of the original cutlet.  More than one food item is used to demonstrate various aspects of real prices. 
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13. Other food/packaging will demonstrate the deception considerations.
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15. The talk MAY progress to dietary health.  In view of the high number of those who are overweight in UK society for whatever reason, the organisers must decide.