It was not difficult to spark the "thesaurisation". Excess reserves at the ECB and the Fed shot up by trillions. Natural market rates for investment were estimated by some around -4% and the central banks kept their rates very high at close to 0%. Yes deflation is worst but low inflation can be terrible in some situations.
"With 0% inflation you have a 10$ loss (20-10), while with 10% inflation you have (20 * 1,1 - 10) = 12$ (about 11$ on constant prices terms) in loss (revenue won't grow till next year)."
Not true, inflation means that revenues are constantly rising faster and financing costs are lower in real terms.