Hong Kong’s businesses, perched within 15 minutes by high-speed rail from the world’s 11th largest economic cluster, is in the uniquely advantageous position to exploit the US$1.65 trillion economy of the Greater Bay Area (GBA), said the chief of the city’s oldest and largest commercial guild.That advantage is particularly important amid Hong Kong’s unprecedented recession, as the arrivals of mainland Chinese tourists and business travellers with their fistfuls of renminbi have plunged to an…