RE: The spreadsheet error did not ruin the global economy, the government debt did. Socialism always crashes, and (except in very rare cases) government debt is alwya a result of socialism
What do you say to the report that if the model included Denmark, Canada, Belgium, Austria, and Australia, and made a few other adjustments, countries, even with a debt-to-GDP ratio of 90% or higher see average growth rate of 2.2%?
The period in which these countries had a debt-to-GDP ratio of 90% or higher average growth rate of 2.2% was immediately after the Second World War.
This debt was due to the consequences of the war namely war debt and the cost of rebuilding after the war. The debt was not wasteful social welfare programs that stifle worker productivity.
The major error in this study could be exactly that it does not specify governments that incure debt due to social welfare state spending and other government debt.