i'll check the podcast.
Another point about shipping. dont know if it was mentioned in the podcast or anywhere here.
The price of steel is a big variable as well. After 2008-09 collapse of commodity cycle, steel was crushed for years and years due to overcapacity both in China for the mills as well as over production of iron ore from the big three.
The way it plays a role has to do with the "salvage value" of old ships. The lower is the price of steel, less interested are the ship owners to capture its break-up value, so that over capacity lingers for years and years in the shipping industry. The higher steel prices go, there is a big incentive for the owners to break up their old ships. Price steel naturally is somewhat correlated with GDP, therefore, there is a feedback loop that tends to provide incentive remove old ships exactly as the economy is about to pick up and inversely, the overcapacity lingers exactly when you don't need it.