We analyze the policy implications of aversion to Knightian uncertainty (or ambiguity) about the possibility of tipping points. We demonstrate two channels through which uncertainty aversion affects optimal policy in the general setting. The first channel relates to the policy’s effect on the probability of tipping, and the second channel to its differential impact in the preand post-tipping re...

We study sequential decision problems where the decision maker does not observe the states of nature, but rather receives a noisy signal, whose distribution depends on the current state and on the action that she plays. We do not assume that the decision maker considers the worst-case scenario, but rather has a response correspondence, which maps distributions over signals to subjective best re...

For portfolio optimisation under proportional transaction costs, we provide a duality theory for general càdlàg price processes. In this setting, we prove the existence of a dual optimiser as well as a shadow price process in a generalised sense. This shadow price is defined via a “sandwiched” process consisting of a predictable and an optional strong supermartingale and pertains to all strateg...

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We deal with a class of generalized fractional programming problems having a polyhedral feasible region and as objective the ratio of an affine function and the power p > 0 of an affine one. We aim to propose simplex-like sequential methods for finding the global maximum points. As the objective function may have local maximum points not global, we analyze the theoretical properties of the prob...

The World Health Organization (WHO) estimates that 84 million people will die of cancer between 2005-2015 [1]. According using the WHO mortality database it has been estimated the total number of cancer deaths in the European Union (EU) and in 2012 is predicted to be 1283101, of which 717398 men and 565703 women [2]. The most common types of cancer that will be diagnosed are lung (C33-C34), int...

The paper derives the solution to a simple stochastic continuous-time dynamic control problem in which a consumer determines consumption and saving while moving between employment and unemployment according to a Markov process. The results differ from the permanent income hypothesis and some of Hall’s 1978 results based on autoregressive income shocks. ∗ The author is indebted to Michael Jeriso...

Retirement flexibility and inability to borrow against future labor income can significantly affect optimal consumption and investment. With voluntary retirement, there exists an optimal wealth-to-wage ratio threshold for retirement and human capital correlates negatively with the stock market even when wages have zero or slightly positive market risk exposure. Consequently, investors optimally...

This study estimates the multi-component efficiency of banks under financial holding companies, including profitability and marketability efficiencies, by utilizing a RAM (Range-adjusted measure) variation model. The analysis process uses the three-dimensional BCG (Boston Consulting Group) matrix created by this study. We find that although semi-publicly-owned banks under financial holding comp...

the main purpose of this paper is theoretically to design the optimal intervention in the foreign exchange market in iran, which has not been investigated by previous studies. the economic fundamentals are strongly affected by the optimal foreign exchange intervention, the consistency of foreign exchange intervention with other policies and political authorities' beliefs about the interven...