Taylor Swift is not just a musical phenomenon, but a business unicorn too. The Eras tour which has arrived in Edinburgh is reckoned to be pushing her wealth well north of $1bn (£785.51m).

Forbes, the money magazine, reckons she is worth $600m (£471m) from performance and her back catalogue is worth as much, while she has around $125m (£98.2m) worth of real estate.

Other musicians who have reached such heights have done so by investing their musical earnings in other ventures.

This daughter of Pennsylvania, and of a financial broker, mints money with astute leverage of her market power. It’s known as Swiftonomics.

She is reputed to demand more than 100% of gross ticket sales, leaving the promoters to make their margins from sales of food and drink and extras. That’s why they want ticket-holders to get there early.

By doing multiple nights at one venue, she cuts touring costs and forces her fans to come to her.