"Egg producers came to me when they had problems – unfair competition from Poland, Bulgarian producers that had not fulfilled the requirements. I helped them cope with these problems. Back then, they told everyone that egg prices won't rise. Now the opposite is happening," Mr Naydenov reminded on Monday, as cited by the Focus news agency.

According to Novinite.com, while Mr Naydenov agreed that certain factors like higher fodder and energy costs may justify increased prices, he stated that the increase should have been by a certain percentage instead of double as much as the previous prices.

"If they do not succeed at convincing me what the reason is or if I suspect a cartel agreement, I will ask the Commission on Protection of Competition to launch an investigation," Mr Naydenov said, referring to egg producers.