Steven Tananbaum sued the artist and gallery in April for failing to deliver works he bought in 2014

The Romanian painter’s prices have increased 160-fold over the past decade. But who, or what, is behind this steep rise?

ArtVilnius fair has just held its tenth edition and is building the market for ex-communist countries with long artistic traditions

Sotheby's sale fell below estimate while Christie’s provided some cheer, showing there is still money in Monet – but only the right one

Sotheby’s auction includes personal works by Hirst gifted to Dunphy, or sketched on the back of restaurant menus

The Polish art lover on her fascination with female artists and how she wishes she could have been seated at Judy Chicago's Dinner Party

Anny Shaw asks if auction houses and dealers should pay their dues to the artists from whom they profit

Follow our tweets tagged #TANsalestally for notable purchases from Art Basel and the surrounding fairs

Revising import controls on cultural goods could impact negatively on trade, dealer organisations say

“For all the supposed desire for transparency, no one will make the first move”

Sector has raised the bar for large works, but price and size do not always match

Melanie Gerlis on how millennials don’t seem to have the same collecting gene as previous generations

Is the UK’s premier award a big draw for international collectors?

Artist lands two big sales at Art Basel after record-breaking auction result

From Gursky to Barney, our pick of five plastic-related works at the fair

But the watercolours are currently at the centre of a closely watched restitution lawsuit

Paris court decision ends legal saga that began in 1991, when the artist died without an heir

Art Basel’s global director on collector behaviour, auction price databases and the complexity of the art market

“The personal is political—this is a clear and present undercurrent,” says Volta artistic director Amanda Coulson

Belinda Neumann-Donnelly claims the work could have made an extra $15m if Hubert Neumann had not tried to block its sale

"This may raise many important Holocaust issues for the French market," Christie’s says

The dealer says her artists encouraged the expansion

A case of man bites dog: auction house turns the tables on Greek government after it was forced to withdraw the figure from New York sale in May

Artist mentored Boo Saville, Helen Beard and Sadie Laska, allowing them to create their largest pieces to date in his studios for Newport Street Gallery show

In a first for Iran, the Teer Art fair is set to open amid a growing but fragile market environment

Hostile relations between Russia and the West following attempted poisoning of former MI6 spy may dampen bidding at London's Russian sales

The Chinese-French Modern master continues to lead art market in Hong Kong

Dmitry Rybolovlev's $450m windfall from Salvator Mundi sale undermined fraud allegation, report says, but criminal cases against Bouvier in Europe are ongoing

The work’s owner, a retired nurse, chose not to attend the sale in person due to nerves “in case it was worth something”

Highest price to date is $1.9m, but Steve Lazarides says some paintings have a £2m-plus price tag