Taming Inflation and Achieving Development

Inflation has been raging wildly in Iran for decades, such that the taming of this monster has become an unfulfilled public wish.
Occasionally, it calms down a little and provides respite to people, only to soon ride another wave of price increases that inundate families and their livelihoods. 
Why is inflation so relentless in Iran? How come inflation is rarely an issue in many other countries? What policies are needed to curb inflation? Why do Iranian politicians fail to take such policies? These gnawing thoughts and nettlesome questions have long been on the minds of the public; many economists have given answers to them. But the problem remains unsolved. Why?