"I am convinced that I can persuade the Civic Platform to rule together with us," Marcinkiewicz told Reuters. He said he would offer budgetary tightening and deeper tax cuts in 2007 as well as faster move to cut red tape in the economy.
Conservative Marcinkiewicz, speaking shortly after Poland's outgoing president said the deadlock might even trigger early polls, called on Civic Platform to return to talks on Friday.
Markets slid after the breakdown of talks on Wednesday on fears Marcinkiewicz's Law and Justice party might form a minority government leaning on far-left and far-right parties hostile to the EU and to market reforms. But the zloty currency regained ground on later hopes of a return to negotiations.
"We stumbled over the division of (government) posts, so the best thing will be to start those talks all over again," he told Reuters in an interview. He said he was ready to start negotiations on a new cabinet line-up from scratch.
Financial markets view Law and Justice with scepticism because their conservative social values and mild nationalism go hand in hand with interventionist views on the economy.
They doubt the merits of adopting the euro, favour state intervention, oppose deregulation of the labour market and made lavish campaign promises to boost welfare.
But Marcinkiewicz pledges to stick to 2006 budget deficit plans, seek further budget tightening and tax cuts in 2007 and possibly discuss the euro in 2007 budget talks appeared designed to assuage Civic Platform as well as markets.
Marcinkiewicz told a news conference he would seek mediators to help revive talks that follow elections held in September.
Outgoing president Aleksander Kwasniewski had injected urgency with blunt comments to journalists.
"Early elections are bad for Poland but in this situation they are a real option," he said. Kwasniewski, who will stay in office until December 23, said he could call polls for January 15.
Polish newspapers said the centre-right coalition was history even before it was formed and the new European Union member was heading for minority rule by the conservatives.
Markets will need much reassurance in a country with high unemployment and plagued by unfisnished reforms and weak governments since overthrowing communism in 1989.
"A minority government means no reforms or even projects which may hurt public finances," said Katarzyna Zajdel-Kurowska, chief economist at the Polish unit of Citibank.
"Without the Platform, there will be no guarantee of stable economic policies and adoption of the euro is under question." The talks broke off after the conservatives, with the backing of populist parties from left and right, pushed through their candidate for the influential post of parliament speaker.
They had initially offered the post to the Civic Platform as part of a power-sharing deal.
The Platform says this showed Law and Justice leaders, identical twins Lech and Jaroslaw Kaczynski, were closer to a coalition with the anti-reform populists who want to undo market reforms and opposed Poland's EU entry last year.
The Platform was weakened when Tusk narrowly lost Sunday's presidential run-off election to Lech Kaczynski.
The Kaczynskis enlisted the support of the Self-Defence party's firebrand leader Andrzej Lepper to defeat the Platform in the speaker vote.