Why is the Marilyn Monroe portrait considered the most expensive painting of the 20th century, costing up to 4.5 trillion?

The 40-square-inch “Shot Sage Blue Marilyn” is one of dozens of paintings legendary artist Andy Warhol did of Marilyn Monroe in the 1960s. Described by experts as one of the rarest and most transcendental works of art in existence, the “Shot Sage Blue Marilyn” portrait was once exhibited at the Guggenheim Museum in New York, […]