New Horizon Aircraft (HOVR) provides a comprehensive technical progress update. Throughout the first half of 2025, the technical team has hit several important milestones that validate Horizon’s ...

In this paper I survey and interpret several of the most important aspects underlying relationships among technical progress, productivity growth, and energy use, viewed from the vantage of an ...

Ricardo's argument on machinery seems to deal both with technical progress and with the substitution of machines for circulating capital. However, they produce different effects, which are to be ...