Purpose: This paper aims to better understand if speculative activity is a factor or even the main factor in the run-up of oil prices in the spot market, particularly in the recent price bubble that occurred in the period from mid-2003 to 2008. Design/methodology/approach: The methodology used...

Purpose: This paper aims to explore the trade-off between liquidity, risk and return under sectoral diversification across distinct economic settings and investment strategies. Design/methodology/approach: A novel multi-objective portfolio model is proposed to assess investment decisions under...