To woo China, Apple must learn that it’s not in California any more

Developing markets offer growth: but the firm’s phones must become cheaper and its services must compete with local rivalsAfter years of boom, Apple looks set for a rockier road in 2019 – partly through faults of its own and partly through social and economic factors that are affecting all the big smartphone manufacturers.The company’s chief executive, Tim Cook, laid the blame for a shock cut in sales forecasts – and the subsequent share price tumble – on the econom