La fiscalité de la richesse est logique, mais elle ne réparera pas notre économie

California voters face a historic decision on Tuesday regarding Proposition 40, a proposed one-time 5 percent tax on the net worth of individuals with assets exceeding one billion dollars. The initiative aims to direct ninety percent of the generated revenue toward funding the state’s Medicaid program. This measure arrives amid heightened political tension, as a coalition of Silicon Valley billionaires has deployed substantial resources to oppose the levy. Critics warn that such taxation will drive wealthy residents out of the state, while proponents argue the tax addresses deepening inequality and fiscal gaps left by federal policy changes. The campaign against the proposal has been led by prominent figures in the technology sector, including Google co-founder Sergey Brin. According to recent reporting, a group of billionaires has spent more than $333 million opposing the measure. Brin alone has invested over $100 million in efforts to block the tax. He is also financing Proposition 42, a companion initiative that would prohibit similar wealth taxes in the future should Proposition 40 fail. Opponents characterize the tax as counterproductive, arguing it will harm the state’s economic competitiveness. Supporters of the tax include six Nobel Prize-winning economists, among them Paul Krugman and Joseph Stiglitz. In an open letter, they stated that the rapid increase in the number of billionaires in California has turned the state into one of the most unequal regions in America. They argue that the super-rich bear a responsibility to address this disparity. The debate is further complicated by the financial strain on California’s healthcare system. Estimates suggest that the state faces a deficit of approximately $100 billion in its programs for low-income residents due to the federal One Big Beautiful Bill Act passed by Republicans last year. Consequently, up to three million Californians could lose their health insurance coverage, while others may face increased premiums. Proponents of the wealth tax point to historical precedents for normalizing high-level taxation. They note that even the standard income tax was initially viewed as an attack on property rights. The Supreme Court struck down an earlier version as unconstitutional in 1895, and it required the 16th Amendment in 1913 to establish the modern income tax framework. Advocates suggest that taxes on massive fortunes may follow a similar trajectory, becoming unremarkable within a decade. Research cited in the debate indicates that the wealthiest households often pay lower effective tax rates than their employees, reinforcing the argument for progressive levies. However, opponents challenge the premise that the ultra-wealthy owe a debt to society that must be settled through taxation. Former International Monetary Fund chief economist Olivier Blanchard recently questioned why California’s wealthiest citizens are spending so heavily to defeat the measure, noting that billionaires have not typically indicated they built their wealth to improve the world. Critics of the tax narrative argue that this perspective misunderstands market dynamics. In a free market, wealth is generated by creating value for consumers, not by extracting it from them. When a consumer purchases a product, both parties benefit from the voluntary exchange. Therefore, profits are viewed as compensation for providing goods and services that enhance societal welfare. Economic analysis supports the view that the benefits of innovation are widely distributed. Nobel laureate William Nordhaus estimated that innovators in the U.S. business sector retained only 2.2 percent of the social surplus they created between 1948 and 2001. The remaining 97.8 percent flowed to the broader population in the form of lower prices, higher wages, and improved products. From this perspective, society has already been compensated multiple times over for the innovations driven by billionaire-led firms. Skeptics of the tax also question whether the state government can manage additional funds effectively. California currently spends roughly $350 billion annually. Opponents ask what specific improvements a few billion dollars in new revenue will achieve compared to existing expenditures. Specific concerns have been raised about potential misallocation of funds. Some critics reference the state’s high-speed rail project, which is priced at approximately $35 billion by the state but estimated closer to $48 billion by its inspector general. Additionally, there are worries about using tax revenues to backfill pension funds, such as the California Public Employees' Retirement System, which admits it is unlikely to meet its assumed 6.8 percent return rate without relying on private equity investments. Although Proposition 40 earmarks revenue for healthcare, opponents argue that money is fungible. Any savings or reductions in other areas resulting from the tax could be offset by new spending, meaning the tax does not solve the fundamental issue of excessive government expenditure. The origin of these vast fortunes is central to the ideological divide. Proponents of redistribution highlight the role of public investment in creating the technologies that underpin billionaire wealth. For instance, foundational technologies for devices like the iPhone, including the internet, GPS, and voice recognition, stem from public research funded by agencies such as the Defense Advanced Research Projects Agency in the 1970s. Similarly, the search algorithms that powered Google’s growth originated from a National Science Foundation project at Stanford. SpaceX, whose recent Nasdaq listing contributed to Elon Musk becoming the world’s first trillionaire, received $396 million from NASA to develop the Falcon 9 and Dragon capsule. The company subsequently secured $1.6 billion to transport cargo to the space station and $2.6 billion to carry astronauts. Critics of the current system argue that the state bears the risks of early-stage technological development while private entities capture the majority of the rewards. This dynamic is described as socializing risk and privatizing reward. A notable example occurred in 2009 when the Department of Energy issued nearly identical loan guarantees to two of Musk’s companies: $465 million to Tesla and $500 million to Solyndra. Solyndra, a solar panel manufacturer, went bankrupt two years later, leaving taxpayers to absorb the loss. Tesla, however, succeeded. Under its loan agreement, the government held warrants exercisable only if Tesla failed to repay on time. Because Tesla repaid its loan nine years ahead of schedule, the warrants expired, allowing the company to retain the full upside of its success. Elon Musk has emerged as a pivotal figure in this discourse beyond his personal wealth. His recent status as a trillionaire follows SpaceX’s entry into the stock market. During the current election cycle, Musk has also acted as the largest political donor, spending $366 million to support Republican candidates. This dual role as a beneficiary of public subsidies and a major funder of political opposition adds complexity to the debate. While some view him and peers as entrepreneurial leaders who transformed public research into commercial giants, others label them part of a "brologarchy" that profits from algorithmic rents derived from controlling digital platforms and data. The outcome of Tuesday’s vote will determine whether California adopts this new form of taxation or maintains the status quo, with implications extending far beyond the state’s borders.