Of course there is a fluctuations, but I don't think that statistical value (per country) is meaningless.
> In the US we work more hours.
And this is an issue of this particular study because... ?
> Growth is a weird factor in economies. It's easy to grow when you aren't at the top.
Are you really sure? Does poor people or poor countries tend to grow significantly faster than developed one?
> The US' population is much more diverse than European countries.
Citation needed.
Of course there is a fluctuations, but I don't think that statistical value (per country) is meaningless.
> In the US we work more hours.
And this is an issue of this particular study because... ?
> Growth is a weird factor in economies. It's easy to grow when you aren't at the top.
Are you really sure? Does poor people or poor countries tend to grow significantly faster than developed one?
> The US' population is much more diverse than European countries.
Citation needed.