Seven major works on show by Greek artist who has become a major figure in the Arte Povera movement

Catalogues raisonnés emerge as the latest front in the battle to authenticate works and secure market value

First reactions to property tycoon’s election to the White House and what it could mean for the arts

Fewer trophy works this season, but solid totals and record prices for several artists

Anti-Castro artist and human rights activist El Sexto believed to have been abducted amid crackdown

Ambitious send-off is also gallery's first recent acquisitions show

Our pick of what to see at museums and private collections, including Bayrle, Kounnelis, a Kiefer double bill

Young star Njideka Akunyili Crosby’s work fetches more than $1m, ten times previous record

The hammer total was below estimate, but met the auction house’s modest expectations for “a contracted market”

Post-war and contemporary evening auction sees several big sales but still falls short of last year’s total

Continuing slump is tempered by online sales in the low and middle market, and a look to greater China for future growth

To what extent could national unease affect the autumn auctions?

Case centres on an editioned Gazing Ball sculpture by Jeff Koons

We examine the two presidential candidates’ arts policies—or lack of them

The Chinese activist-artist, who lived in the city during the 1980s, comes back with new tree sculptures and an installation of cast-off clothing from refugee camps

RISBE aims to ensure that artists and galleries are paid promptly

Case between collector and dealer over a sculpture damaged in transit becomes a legal saga