Answer:
1) Improved transport, making global travel easier. For example, there has been a rapid growth in air travel, enabling greater movement of people and goods across the globe.
2)Containerisation. From 1970, there was a rapid adoption of the steel transport container. This reduced the costs of inter-modal transport, making trade cheaper and more efficient.
3) Improved technology which makes it easier to communicate and share information around the world. E.g. internet. For example, to work on improvements on this website, I will go to a global online community, like elance.com.
