The information about the date and audience of the speech is not provided in the question. Please provide more context or information about the speech.
According to King, Reagan's economic policies had negative effects on the poor and marginalized communities. She argues that Reagan's policies resulted in increased unemployment, reduced funding for social welfare programs, and widening income inequality.
King cites several pieces of evidence to support her claims, including statistics on rising poverty rates and unemployment, the reduction of funding for social welfare programs, and the increased concentration of wealth in the hands of a few wealthy individuals. She also notes that Reagan's policies resulted in cuts to education, healthcare, and housing programs, all of which disproportionately affected low-income and marginalized communities.
King's speech can be considered a trustworthy source about the effects of Reaganomics, as she was a prominent civil rights activist and the widow of Martin Luther King Jr. Her perspective is valuable in understanding the impact of Reagan's policies on marginalized communities. However, as with any source, it is important to consider potential biases and to corroborate her claims with other sources of information.