The emphasis on what economists have called “the great wage slowdown” of the 21st century is the result of Mrs. Clinton’s months of conversations with more than 200 domestic policy experts and dozens of economists. She believes that increasing the wages of average Americans to reduce income inequality is the “defining economic challenge of our time,” a campaign aide said. To that end, Mrs. Clinton will present proposals that include paid family medical leave, an increase in the federal minimum wage and incentives for corporations to increase profit-sharing programs. She will also praise President Obama’s plan to make more workers eligible for overtime pay.

Mrs. Clinton will highlight the economic record of the administration of her husband, former President Bill Clinton, when median family income, adjusted for inflation, increased to $56,080 in 1999 from $48,884 in 1993, according to census data. But she will also lay out a vision that contrasts with Mr. Clinton’s message of self-reliance and his assertion that the era of big government was over.

Mrs. Clinton will also propose more investment in infrastructure, tax relief for small businesses, better access to child care, assistance to make college more affordable, stronger support for collective bargaining and tax increases on the wealthiest Americans.