I am going to have to differ with you on this. Follow the money. Politicians go into office with only marginal holdings, many are about broke because they spent most of their personal assets on their own campaigns to get elected. But within a year they are multimillionaires, withing five years they are Billionaires. They did not get that way from the wages paid by taxpayers to hold office.
There is a source of this under the table income, they are on someone’s payroll to do someone’s bidding. They work for the Global Corporations who dictate their actions and decisions. They are not the brains, they are too incompetent and inept. They are just place card figure head puppets and Global Corporations are pulling their strings.
But I suggest the greatest currency isn't money, but power.
And, ultimately, the government has the power. Then, of course, the ones who have the most direct control over the government (via the government's purse strings) are politicians.
Large corporations have an enormous of power, but their power is nothing compared to that of the government.
Though I don't know for a fact, but I'll bet they own many politicians lock, stock, and barrel...and could conceivably have the power to take over an entire government by force.