A preference-theoretic characterization of weak complementarity is provided based on an explicit representation of revealed preference. Weak complementarity is defined in terms of the observable property of nonessentiality and the unobservable property of no existence value. Preference-theoretic characterizations of these properties facilitate a precision and intuition that is not generally ava...

We investigate how an investor’s preference for sustainable assets in the portfolio varies differing levels of risk aversion. Using a sample 411 publicly listed firms S&P 500, we calculate financial and sustainability returns, on which utility depends. approximate by exponential s-shaped function optimize with regard to preference. find that increasing aversion, both minimum-variance maximu...

the current study aims to identify the effective factors and barriers to loyalty in electronic banking services in the private banks customers. for this purpose, a survey was done with a questionnaire sampling from 420 customers of private banks in golestan province, who have used electronic banking services in 2011. the results indicated that seven factors including preference, customer satisf...