Leading dealer says only 25% of sales should be outside gallery

Auction house sues seller while Frenchman at centre of saga denies painting is a modern copy

A 2014 sale of photographs from the non-profit's collection set an auction record

Uncertainty is the name of the game, made unpredictable by international politics and an economic downturn in the Gulf

Expert opinions concerning attribution and authenticity are fundamental to art history

Dealers downsize or go online as tastes in furniture and collecting change

Sophisticated data tools aim to improve knowledge and boost confidence

As forgery cases pile up, auction house is also setting up a scientific research department

Enterprising dealers are updating their businesses to cope with a changing market

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

Fair’s Public section in Collins Park will take inspiration from the late musician

Dealers and museums join forces to put the Malaysian capital on the art map

The artist himself has denied that the works investigated by police are fakes

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

But mixed results at the Impressionist and Modern Art sale in New York reflect continued cautious market

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

Business is growing but no one has truly disrupted the market—yet

Solid results for Sotheby’s in first sale after Trump's election victory, but László Moholy-Nagy gets the only artist record

New York's bitforms gallery brings show of digital works to San Francisco

After last year’s catastrophe, fair expands its exhibition spaces

To what extent could national unease affect the autumn auctions?

German dealers were due to move to another building

Images by Man Ray, Diane Arbus and early Gilbert & George tempt collectors as auctions buck up

In London, low estimates and favourable exchange rates boost contemporary profits… but at the Italian sales, fewer stand-out lots bring results down from last year’s high

Female artists lead sections curated by Jens Hoffmann and Pablo León de la Barra