Dealers need to participate in international art fairs and have spaces abroad to gain respect back home

Lempertz, Berlin, Berlin Sale, 2 May

Sotheby’s has launched its third model, back in tandem with eBay, while its numerous competitors are trying many different methods to grow internet sales

Leslie Hindman, Chicago, Property from the Collection of Carol and Richard Levin, 20 May

New law would dilute powers of the “commissaires-priseurs” system and give responsibility to non-experts

The fourth edition of the fair gives visitors more choice than ever

Ketterer Kunst, Munich, Old Masters and Art of the 19th Century, 22 May

Despite paying lip service to diversity, New York’s major museums, galleries and university programmes are bound tightly together in a system that favours the privileged

The move to the Tour & Taxis site next year coincides with the launch of the Independent fair in the burgeoning contemporary art hub

Tiroche DeLeon collection focuses on works from developing countries<br>

But buyers are not risking large sums, with the majority of works still priced below £10,000

New three-floor layout revived the German fair this year<br>

German galleries, especially those from Berlin, are flocking to the revitalised fair this week<br>

The Miami-born fair plans to keep pace with Art Basel

The journal that Alan Turing used to jot down his thoughts on a universal language was later turned into a dream diary by one of his student

Its founders want to raise $40m and plan to support the continent’s museums

Liu Yiqian bought a Song Dynasty <i>guan</i> vase for $14.7m at Sotheby’s Hong Kong this week

Paris Beaux-Arts’s first edition was handicapped by awkward timing and a vague concept

<h5>Event organisers end sponsorship agreement with city officials after complaints from arts community, but “damage is done” Andrea Ferrero says</h5>

Local works will be prominent at Art Basel and the new Art Central satellite fair