Jeremy Hunt brought in the regulators for the energy (Ofgem), water (Ofwat) and telecoms (Ofcom) sectors, along with the Competition and Markets Authority (CMA) and City watchdog the Financial Conduct Authority (FCA).
The Treasury said the FCA would report by the end of July how the market was allowing savers to benefit from higher interest rates.
It also said the CMA would introduce new investigations in markets where prices were rising and speed up its reporting of grocery competition and pricing.
Ofcom has agreed to push all suppliers to introduce discounts for vulnerable broadband and mobile customers, and waive fees for customers who switch providers to access such discounts.
