Answer the question from the given passage. Your answer should be directly extracted from the passage, and it should be a single entity, name, or number, not a sentence.

Passage: Economist Joseph Stiglitz presented evidence in 2009 that both global inequality and inequality within countries prevent growth by limiting aggregate demand. Economist Branko Milanovic, wrote in 2001 that, 'The view that income inequality harms growth – or that improved equality can help sustain growth – has become more widely held in recent years. ... The main reason for this shift is the increasing importance of human capital in development. When physical capital mattered most, savings and investments were key. Then it was important to have a large contingent of rich people who could save a greater proportion of their income than the poor and invest it in physical capital. But now that human capital is scarcer than machines, widespread education has become the secret to growth.' Question: What has been the main reason for the shift to the view that income inequality harms growth?
increasing importance of human capital in development

Passage: Under the terms of the Scotland Act 1978, an elected assembly would be set up in Edinburgh provided that the majority of the Scottish electorate voted for it in a referendum to be held on 1 March 1979 that represented at least 40% of the total electorate. The 1979 Scottish devolution referendum to establish a devolved Scottish Assembly failed. Although the vote was 51.6% in favour of a Scottish Assembly, this figure did not equal the 40% of the total electorate threshold deemed necessary to pass the measure, as 32.9% of the eligible voting population did not, or had been unable to, vote. Question: What percentage of Scotland's voting population failed to actually vote?
32.9%

Passage: Peyton Manning became the first quarterback ever to lead two different teams to multiple Super Bowls. He is also the oldest quarterback ever to play in a Super Bowl at age 39. The past record was held by John Elway, who led the Broncos to victory in Super Bowl XXXIII at age 38 and is currently Denver's Executive Vice President of Football Operations and General Manager. Question: Prior to Manning, who was the oldest quarterback to play in a Super Bowl?
John Elway