Global tourism has grown exponentially over recent decades. The cost of travel has come down. It's easy to research and organise a weekend away with a few clicks, and more people have the income to travel.

We shouldn't expect global tourism to slow. Travel is becoming cheaper and easier. In our selfie world of cheap consumer goods, travel offers a great way to break the boredom of daily life.

In New Zealand, we now get nearly 4 million visitors a year, up four-fold since 1990. Kiwis took nearly 4 million trips offshore, also up four-fold since 1990. Sometimes it's cheaper to go on a overseas trip than a local holiday.