Bloomberg surveys the mood before the Frieze Week sales:

• “Nearly 1,000 lots is pushing the envelope, particularly given the current economic climate,” said the New York-based art adviser David Nisinson. “Though I think that buy-in rates may be higher than desired and there may even be a few conspicuous failures, I imagine that the auctions will perform reasonably well and some prominent lots will probably bring high prices.”

• “There’s still momentum in the market,” said Anders Petterson, founder of the London-based database ArtTactic, which is surveying confidence levels of buyers and sellers. “It could well be business as usual. There’s been a shift in sentiment, though. People think things could get worse in six months, except for some high-end pieces at more than $1 million.”