How did Harriet Taylor influence John Stuart Mill’s social and political thought?

Harriet Taylor, who became John Stuart Mill’s wife in 1851, exerted a profound influence on his social and political thought, particularly regarding his vision for the individual and society.1

While Mill explicitly stated that he did not owe his technical economic doctrines to her, he credited Taylor with shaping his broader ideals. Her influence was instrumental in his transition to a "third stage" of political economy, where he began to critically re-examine the foundations of society, including the nature of property and the distribution of wealth, rather than accepting existing social structures as sacred.1

Furthermore, Taylor was the direct inspiration for his work on the enfranchisement of women, a cause that remained central to Mill’s later political career. Mill and Taylor collaborated on several books on ethics and politics, and he dedicated his famous essay On Liberty to her memory, reflecting the deep intellectual partnership they shared.21