So LVMH started to watch its customers more closely
Speaking on a conference call earlier last year, Jean-Jacques Guiony, chief financial officer at LVMH, said: "We've placed strict retail restrictions for the amount of products that people can buy.
"But, when you see someone in a store, you don't know whether they are buying handbags for themselves or to sell them on to the market in China. We are trying to make sure we are not competing with our own products in the China market, but our actions are not entirely bullet-proof."
Grey market