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You can see in the image above that the upward trend started in May 2021 after being around 100. What happened at that time that has caused the price to slide at a consistent rate? It's not going up and down, but linear, and more aggressive towards the end.
We saw the the recent news about buying oil in KES, apparently it will ease the demand for USD.
Your question can be answered only by understanding the exact cause, which I don't know. The CBK governor knows.
I hear China devalues its currency to make is cheaper for international buyers to buy Chinese goods. Don't know what the case is for Kenya, maybe it's because of multiple factors. I suspect it's because we import more that we export, the demand being high for USd creates an opportunity for those who hold it to sell it at a higher price.
A fool-proof method would be to back KES with Gold, like what the BRICKS nations want to do with the currency that they will launch. If KES was gold backed, it would be getting stronger against the dollar, because gold price has been going up and the USD has been depreciating.
USD itself has been depreciating since going off the gold standard, while the fed has been making it worse by printing more. The US gained it's superpower status because the whole world has been using USD for global trade. The US has the printer. They can just digitally create any amount and then any country will accept the USD for goods and services.
Zimbabwe under sanctions launched their own gold coin, IMF told them to get rid of it, because the west knows that any currency that's backed is better that a currency that's printed from thin air.
Gaddafi wanted a gold backed African currency, they took him out.
Africa can have a very strong and stable currency that's inflation-proof, simply by backing it by the diverse minerals and resources that it has.
They tried to bury us, they didn't know we were seeds.