What We Are Reading Today: Trading at the Speed of Light by Donald MacKenzie

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Updated 02 February 2023
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What We Are Reading Today: Trading at the Speed of Light by Donald MacKenzie

In today’s financial markets, trading floors on which brokers buy and sell shares face- to-face have increasingly been replaced by lightning-fast electronic systems that use algorithms to execute astounding volumes of transactions.

“Trading at the Speed of Light” tells the story of this epic transformation.

Donald MacKenzie shows how in the 1990s, in what were then the disreputable margins of the US financial system, a new approach to trading — automated high-frequency trading or HFT— began and then spread throughout the world.


What We Are Reading Today: A Capital’s Capital

Updated 16 February 2026
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What We Are Reading Today: A Capital’s Capital

Authors: Gilles  Postel-Vinay and Jean-Laurent Rosenthal

Successful economies sustain capital accumulation across generations, and capital accumulation leads to large increases in private wealth. In this book, Gilles Postel-Vinay and Jean-Laurent Rosenthal map the fluctuations in wealth and its distribution in Paris between 1807 and 1977. 

Drawing on a unique dataset of the bequests of almost 800,000 Parisians, they show that real wealth per decedent varied immensely during this period while inequality began high and declined only slowly. 

Parisians’ portfolios document startling changes in the geography and types of wealth over time.

Postel-Vinay and Rosenthal’s account reveals the impact of economic factors (large shocks, technological changes, differential returns to wealth), political factors (changes in taxation), and demographic and social factors (age and gender) on wealth and inequality.

Before World War I, private wealth was highly predictive of other indicators of welfare, including different forms of human capital, age at death, and access to local public goods.