* Investors see tough decisions ahead for new President Paz * IMF help viewed as vital given current dire state of finances * Debt payment crunch looms in March (Adds investor comment in paragraphs 7-8, updates prices in paragraph 6) By Marc Jones LONDON, Oct 20 (Reuters) – Investors welcomed the Bolivian presidential election win for centrist candidate Rodrigo Paz as markets reopened on Monday, but cautioned he now faces a major challenge fixing the economy, and will likely have to soften his resistance to IMF support. The victory of Paz, a senator from the Christian Democratic Party, in Sunday's run-off vote marked a historic shift for the South American nation, which has been governed almost continuously since 2006 by Bolivia's Movement to Socialism (MAS) party. Paz's moderate platform

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