Illegal to tout and overcharge

I read a newspaper report that taxis now put up a sign "It is illegal for electronic stores and tailors to tout and overcharge".

What is touting? Are financial products being marketing at MRT stations considered as touting?

What is over-charging? Many financial products have excessive charges that give poor value to consumers.

Will it be illegal for financial institutions (i.e banks and insurance companies) to tout and over-charge for their financial products?

Why only go after electronic stores and tailors, when the overcharging in financial products is 10 times or more?