I disagree. The problems managing the supply side tend to be very predictable - they happen most years. So you constantly see problems but they are manageable

I disagree. The problems managing the supply side tend to be very predictable - they happen most years. So you constantly see problems but they are manageable. The problems managing the demand side are unpredictable. For many years you'll be going along fine, but when you have a problem you tend to have a BIG problem. Of the two, you're better having manageable problems most years and no big disasters than having things usually go smoothly but occasionally you get a disaster.