Romania’s finance ministry announced some sort of "tax on greed" for banking sector:
Romania’s finance ministry plans to introduce a tax on banking assets from 2019, seeking to cap the interbank ROBOR interest rates at a reference level of 1.50 percent, minister Eugen Teodorovici said on Tuesday.
(..) the new tax would rise gradually, from zero percent for an ROBOR rate of 1.5 percent, to maximum 0.9 percent of banking sector assets for a ROBOR rate of 3.01 to 3.50 percent.
However, this value seems to be significantly lower than inflation rate (about 4-5%).
I am wondering why the government force such a small value and not let the market settle this value.
Question: What is the rationale of capping interbanking rates to values significantly lower than inflation rate?