A speculative exploration of value, emphasizing practical experimentation in its future forms How can we begin to envision a postcapitalist economy without first engineering a radically new concept of value? And with a renewed sense of how and what we collectively value, what would the transition to new social forms look like? According to Brian Massumi, it is time to reclaim value from the capitalist market and the neoliberal reduction of life to “human capital.” It is time to occupy surplus-value for a postcapitalist future. 99 Theses on the Revaluation of Value is both a theoretical and practical manifesto. Massumi reexamines ideas about money, exchange, and finance, with special attention to how what we value in experience for quality is economically translated into quantity.  He proposes new conceptual tools for understanding value in directly qualitative terms, speculating on how this revaluation of value might practically form the basis of an alter-economy. A promising path, he suggests, might involve emerging blockchain technologies beyond bitcoin. But these must be uprooted from their libertarian origins and redesigned to serve not individual choice but collective creativity, not calculations of self-interest but collaborative speculations on the future to be shared. It is necessary to grasp the specificity of our contemporary neoliberal condition and the ultimately destructive forms of power it mobilizes to better resist their claim on the future. 99 Theses on the Revaluation of Value is written to galvanize a radical redefinition of value for a livable postcapitalist future.