If you want to meet a ruthless financial trader, here is my advice. Forget the City of London or Wall Street; simply walk upstairs, knock on a bedroom door and say hello to your teenager.
To judge by the experiences of friends and acquaintances with their offspring, there is a fair chance that yours is a market veteran. His or her asset class is not fixed income, equities or commodities but clothes and shoes.
You may wonder what they do on their phones all day. They could be idly spending time on Snapchat and Instagram with friends but they are equally likely to be monitoring their Ebay or Depop accounts, trading Supreme hoodies and Palace caps.