I was able to locate UK data to run some portfolio tests on. Unfortunately its annual data which creates the effect of making stocks look more stable and less volatile than they are but still, I can learn some things from it regardless
Some things that I was able to learn by looking at the data (preliminary findings that might change if I notice errors):
-The UK had a much less bad experience in the Great Depression, with annual data, the worst drawdown in the stock market was -23% real, vs -54% in US stocks. The decision from the UK to get out of the gold standard in 1931 vs the US in 1933 look like helped to prevent the deflationary spiral from getting worse. As a result stocks recovered a lot faster. Returns adjusted by the local (UK) price index and the GBP rate (in the case of gold):
Returns adjusted by the local (US) price index:
-UK bills beat the UK gilts 40% of the years
-UK bills beat UK stocks 27% of the years
-The UK yield curve was inverted (UK bill returns were higher than the yield on UK gilts) ~12% of the years
-UK Gilts had many staggering drawdowns. During WW1 they lost -66% (total real return) from 1914 to 1920 (The war was over after 1918 but there was probably some money printing going on to pay for things after it).
US did a little better, my UK gilts data is with 20y maturities, my US data is for 10y maturities. Total real return in US bonds in WW1 (plus 2 years after) was -34%, if I do a rough adjustment for the duration difference, I'm getting to -51% real. A little less bad
Gilts also lost -43% real from 1972 to the end of 1974 during their fiscal crisis when they had to be bailed out by the IMF. Vs -14% real in US bonds, or -21% duration adjusted
On the other hand, US bonds got hurt in the late 80's with a -34% real drawdown vs +9% real from UK gilts.
The UK might offer a guideline of what to expect with the US, if it continues on its path of deficits and war spending. We can expect a fiscal crisis with a big loss to holders of US bonds (especially for holders with a lot of duration), inflation and a collapse in the exchange rate