Germany's SPD leaders list key demands of Merkel for coalition By Holger Hansen BERLIN (Reuters) - Leaders of Germany's Social Democrats (SPD) have listed their key demands of Angela Merkel ahead of a meeting on Sunday in which they will seek the backing of 200 core party members for launching formal coalition talks with the chancellor. These include introducing a nationwide minimum wage of 8.50 euros, equal pay for men and women, a financial transaction tax, greater investment in infrastructure and education, and a strategy to boost growth and employment in the euro zone. No mention is made however of the tax increases for Germany's wealthiest which the SPD had campaigned for during the election but which the chancellor has absolutely ruled out. Merkel's conservative bloc - her Christian Democratic Union (CDU) and its Bavarian sister party, the Christian Social Union (CSU) - emerged as the strongest political force in the September 22 election. The SPD, which came a distant second to Merkel, was seen as the most likely partner from the start; however the party is taking a stubborn approach as it struggles to avoid the mistakes it made during its 'grand coalition' with Merkel from 2005-2009. It emerged from that legislature with its worst election result since World War Two, making many grassroots members highly skeptical about another such union. "This time I can guarantee that we will not strike a coalition agreement in which we do the opposite of what we pledged in the election," SPD Chairman Sigmar Gabriel told German newspaper Bild on Saturday. A draft of the declaration Gabriel will ask the SPD's top cadre to sign on Sunday and made available to Reuters states the SPD "agrees to enter formal coalition talks with the intention of forming a government." The party concedes some compromises will be necessary but lists 10 "essential" points beginning with the minimum wage. Others include equal pensions for seniors in the former West and East Germany, the ability to have dual citizenship, and measures to make it easier to combine work with family life. If, as expected, Gabriel secures party backing on Sunday talks on coalition policies and cabinet posts in a new government would begin on Wednesday. Few expect an eventual partnership deal to greatly alter Merkel's cautious domestic and foreign policy agenda. But when those talks broke down earlier this week, it strengthened the SPD's hand and a grand coalition seemed all but inevitable. Once a coalition deal is struck, the SPD is still set to seek final approval in a poll of its grassroots members. Writing by Alexandra Hudson; Editing by Eric Walsh