Why does the price of Iranian saffron go up and down?

Why does the price of Iranian saffron go up and down? The head of the Khorasan Razavi Saffron Exporters' Union said: Lack of liquidity sometimes reduces the price of saffron by 150 to 200 thousand tomans per kg, and this price fluctuation is the biggest problem that does not allow exporters to operate properly. Gholamreza Miri [...]