I like this simple example of the power of packaging structure, because I distinctly remember staring at these for minutes on end, to triple-check that they were actually the same product.

The possibility of parting with north of seven quid for that cheap Own Label copy of proper lubricant on the right makes me shiver.

But £7.48 for the specialist ‘Pro’ product on the left, no problem. Stick a half-decent label on it and you could make it £7.99. Kerching!