Which investment instrument provided returns against PPI and CPI?

The ÜİK announced the most profitable investment vehicle of May. While all investment vehicles caused losses based on PPI, the dollar gained 3.86% in the last month based on CPI. While the Euro provided a real return of 1.61% to its investors, gold bullion lost 0.62%, deposit interest (gross) 1.80%, BIST 100 index 2.79% and DİBS 3.10%. While the highest monthly return was in the dollar, when reduced by CPI, BIST ranked first with a return of 4.53% in the 3-month period. When calculated in the 6-month period based on both PPI and CPI, no investment vehicle made a profit, while gold bullion lost the least. Gold became the investment vehicle that caused the least loss to its investors with a rate of 2.78% when reduced by PPI and 16.95% when reduced by Yİ-PPI. In the same period, DİBS became the investment instrument that caused the investor to lose the most by 43.27% when discounted with PPI and 33.59% when discounted with CPI. Based on the last one-year period as of May 2021, gold bullion took the first place with an 8.76% return. When discounted with CPI, while the dollar made its investor earn 8.31%; BIST 100 index made its investor lose 2.17%, Euro 5.60%, deposit interest (gross) 32.86% and DİBS 37.08%.