Financial Tribune - Trading at Tehran Stock Exchange has seesawed in the past few weeks.

While the main index TEDPIX surpassed 140,000 two weeks ago to set a historic record, the days that followed registered a 7,000 decline to 133,000.

Experts believe that ambiguities in the pricing of metal and petrochemicals on Iran Mercantile Exchange, along with systemic risks, were the most important reasons for the decline in stock prices. IME pricing formulae and TSE investments are closely connected.