Main opposition Law and Justice (PiS) party leader Jaroslaw Kaczynski proposed to hold a conference with with Poland's prominent economists as participants on the economic changes recently presented by PiS on September 24.

"There is a need for a serious debate on all these issues, much different from what we saw yesterday (finance minister's criticism of PiS's proposals - PAP).

Therefore we suggest organising on September 24 a conference attended by economists to discuss the proposals and any other supplementary proposals... without verbal abuse and accusations," Kaczynski told a press conference.

Finance Minister Jacek Rostowski estimates that introducing economic proposals of main opposition party PiS would cost the budget PLN 54.5 billion in 2013, he said at a press conference on Thursday, calling such growth-stimulating ideas impossible to maintain even mid-term and catastrophic for Polish public finance.

Experts interviewed by Rzeczpospolita daily are not as critical as the Finance Minister and believe that some of PiS ideas, such as investment tax break, should be implemented.