regulation
Do note that the greatest financial and business growth was during a time of Strong regulation of finance and business, no matter the size of govt. Once the corporations got their hooks into govt to entrench themselves, the regulations were loosened--all this does is to advantage the larger companies already in a particular market, as it allows them to freeze or squeeze out the competition.
Also, govt should always hold onto infrastructure that is non-competitve--hospitals, public transport, a few other things. If they don't, all they do is get worse and cost more under private companies.