German Finance Minister Christian Lindner has signalled his support for improving European stability rules to promote sustainable investments. During a visit to his Italian counterpart Daniele Franco in Rome on Friday, the leader of German’s business friendly Free Democrats nonetheless stressed that he didn’t support softening the rules on debt reduction. Italy and France in particular have recently pushed for adjustments. The EU’s Stability and Growth Pact stipulates that countries should not take on more than 60% of their economic output in debt and that budget deficits be capped at 3% of gr…