What makes you trust someone in a professional context? I liked this simple equation by Charles Green which makes it a combination of how credible, reliable, and how intimate — or how safe you feel with that person — divided by the self-orientation of the person — are they focused on their interests, or simply paying more attention to themselves vs being genuinely interested in you and your success. Depending on how you scored this abstract model I guess that would mean that trust is either undermined by someone focusing on their own interests, or strengthened the more they are focused on yours.

The trust equation

I grew up with the idea that there are developed countries and developing countries. There was the ‘rich’ world and the ‘poor’ world. I didn’t actively consider it. It’s just always been there. And it’s wrong.

In his excellent book Factfulness, Hans Rosling shows that wealthier countries tend to have smaller families and a low child mortality rate. In contrast, poorer countries are more likely to have larger families and a high child mortality rate. Plotting the spread of countries in 1965 gives a reasonable approximation of a cluster of ‘developed’ countries with small families where most children survive and a cluster of ‘developing’ countries with larger families where more children die. But that was in 1965.

The world has changed a lot since then, and that model of dividing the world into two buckets no longer holds true with the data. Most people in the world are somewhere in the middle.

And more helpful than dismantling my worldview was providing a new model to replace it: a model with 4 income levels instead of 2 and the number of billions of people living at each level. It’s a model with most people somewhere in the middle.

For more, check out the Factfulness book, or Gapminder. And you could do much worse than watch Hans’ entertaining TED talk: the best stats you’ve ever seen.

A world of 4 income levels

If you took all the taxes a country pays each year on one hand, and all the money that people earn on the other, tax freedom day represents the day after which the country’s taxes would be paid by its citizens and the remaining earnings free to spend as they wish. It’s a national average as each individual’s tax freedom day would be different, though in principle you can calculate your own.

Given taxes vary between countries, each country has a different tax freedom day — though it’s not easy to compare as calculations tend to differ. In the US it’s calculated by the Tax Foundation.

Tax freedom day