    Sentence. 1: What: did’ higher’. materials-living  standards leadto for. mast of-human history?    Senterice .2: This pattern ‘of higher iricomes~  longer. livés, stit! holds. arhond paorer cauntries,  where. life expectariey increases rapidly as: per  capita iricome inéréases, but'in recent decades  it. -has. ‘slowed down ;among: middle ‘income  ‘eouritriés -and “plateaued “among the ricliest  thirty or so‘couitries in, the world