By cutting taxes and avoiding spending cuts, Donald Trump claims to have a plan to generate a $7 trillion budget surplus. We can only speculate wildly about the details

So these "other factors" must be pretty amazing stuff. Perhaps this will be akin to the apocryphal "secret plan" of Richard Nixon to end the Vietnam war. Perhaps, like Mr Trump's tax returns, the details will not be released until after the November poll.

So we can only guess at what his cunning plan might contain. Here are a few speculative suggestions.

The word America should be trademarked and back royalties charged. Don McLean alone will owe hundreds of billions for "American Pie".

Take the Social Security trust fund and put it on black at one of Trump's casinos

Redenominate Treasury bonds in yen, instantly cutting the national debt's nominal value by 99%

Redefine the word "deficit" as "surplus"

Since tariffs with China will be so great for the US economy, introduce tariff barriers between individual states, so goods moving from New Jersey to New York will face a levy. Tax revenues will soar

Given Mr Trump's admiration for Vladimir Putin, subcontract all US defence spending to Russia

Extend the Mexican wall right the way round the coastline. This will prevent immigrants, and imports from getting in, improving the trade deficit; also, you can charge people $100 to visit the beach

Offer other countries the right to have Mr Trump as their acting President, two days a week, in a competitive auction.

The money should flood in.