In a bustling Bangkok market, hundreds of wholesale vendors have been selling black clothing since dawn – several with hefty discounts – in honour of Thailand’s late former queen. Rows of black T-shirts at a small stall hang near a banner reading “black shirts 40 baht” – a fraction of the usual price of 200 to 500 baht (US$6 to US$15) – drawing a steady stream of shoppers. “We sell at this price so all Thais can wear black to pay respect to the queen mother,” said the business’s owner,...