We study the association of shareholder returns with liberalization in government policy during Britain's railway run-up of 1844–5. The findings sustain two main claims. First, the railway returns during the run-up were associated with the advent of liberalizing policies, especially related to free trade, enhanced transparency and governance of firms, and industry consolidation. Second, analysis of cross-sectional variation reveals higher returns to large railways in the South and Midlands of England, several of which were leading consolidators. This study is the first to report an association between policy liberalization and run-up returns and to identify consolidators as the prime beneficiaries of the liberalization.

For two decades, economic agents have been investing in the personal data-driven industry on the assumption that courts, the keepers of the legal systems, would have backed their claims, turning their technological control of personal data into legally protected property rights. Courts' backing has proved only temporary as they are now revising early solutions by constraining collection, use, and trade of personal data to protect the hierarchically superior rights. The theory of ‘legal bubbles’ rationalizes the economics underlying the legal shockwaves affecting the personal data-driven economy. ‘Legal bubbles’ tend to arise when economic agents invest in the economic exploitation of a new resource in a context of uncertainty and ignorance about the legal implications of innovative activities. These legal foundations may eventually turn out to be unstable as a result of courts' ex-post attempt to re-adapt them to the previously ignored implications of unconstrained commodification, with disruptive economic consequences.