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In the domestic credit market creditor and debtor rights are clearly defined. In contrast, sovereign debt repayment is largely contingent on the debtor government’s willingness to repay as enforcement of contracts at the international level is limited. In this chapter we explore different sources of sovereign debt crises as opportunistic and myopic behavior by debtor nations, over-consumption of imported goods, credit temptation by lenders eager to allocate savings surpluses, and unexpected consequences of initially seen appropriate policies. We explore how these factors have played out in the Euro-debt crisis and outline a framework for creditor responsibility to complement debtor self-restraint.

One aspect of the opportunities and challenges for cryptoassets concerns decentralized finance (DeFi). DeFi is a growing area of cryptoassets that couples blockchain technology, digital assets, and financial services. DeFi is a publicly available system on a decentralized blockchain network, offering financial products and applications. This chapter provides an overview of the DeFi universe that has enormous potential in various industries in the global market. It also discusses the implications of DeFi’s new wave and its applications involving initial coin offerings and stablecoins and specific challenges like the scalability trilemma in DeFi and financial markets.

Both consumer and corporate credit ratings agencies played a major role in the US subprime mortgage crisis. Equifax, Experian, and TransUnion deployed a formalized scoring system to assess individuals in mortgage origination, mortgage pools then were assessed for securitization by Moody's, S&P, and Fitch relying on expert judgment aided by formal models. What can we learn about the limits of formalization from the crisis? We discuss five problems responsible for the rating failures – reactivity, endogeneity, learning, correlated outcomes, and conflict of interest – and compare the way consumer and corporate rating agencies tackled these difficulties. We conclude with some policy lessons.

This chapter examines the effect of changes in the public debt–gross domestic product (GDP) ratio on long, 10 year, interest rates in a panel of 17 countries over the period 1870–2016 controlling for other variables, in particular the world interest rate. Over this long period, one can argue that most of the big changes in public debt were the product of factors largely exogenous to national interest rate determination, such as war, depression or financial crisis. The issue is of current relevance since the Covid-19 pandemic has caused large increases in the ratio of public debt to GDP in many countries. The estimates suggest that it is the change in debt, rather than the level of debt or the deficit that matters for long interest rates. World interest rates have long- and short-run effects on interest rates which are very well determined and close to one. Current inflation has a small but significant effect.

Conflict in various forms is a natural consequence of the power of one party to take actions and decisions that affect others. It can be studied from many different standpoints. In policy conflict, the relative complexity or simplicity depends very much on whose interests are being considered as new measures are debated. Many policy issues are more complex than most people thought. They are simplified for public debate. Some interests are marginalized while others remain central to the discussion. Realizing the inherent trade-offs, knowing what elements of debate are present and absent, and what are the causes of the policy structure that we observe are all central to understanding the representative nature of policy conflicts. This is what the book is all about.