Forecasting things like (not limited to) GDP growth, unemployment and inflation is tricky business. Very few get it consistently right (especially policy makers). And whilst macro forecasting is generally a fool’s errand – there are things we can observe to improve our probabilities of success (or at least reduce our risk). Consider inflation… whilst not perfect – there are a set of reasonably strong correlations which exist over extended periods. And it’s these types of correlations we can use to our advantage.As I will demonstrate – over the past 5 decades (after the US dollar removed its peg to gold in 1971) – inflation levels have largely correlated to what we see with commodity prices.