The types of business which are most likely to use artificial intelligence are seeing growth in workers' productivity that is almost five times faster than elsewhere, raising hopes for a boost to the broader economy, accountancy firm PwC said. Productivity in professional and financial services and in information technology grew by 4.3% between 2018 and 2022 compared with gains of 0.9% across construction, manufacturing and retail, food and transport, PwC said.