The impact of oil shocks on innovation for alternative sources of energy: Is there an asymmetric response when oil prices go up or down? Journal of Commodity Markets Journal Article I.C. Nunes Margarida Catalão-Lopes Publication Year of Publication: 2020 Volume: 19 Pagination: 100108 Identifiers ISSN: 2405-8513 Other Numbers: 2-s2.0-85073715782 Locators DOI: 10.1016/j.jcomm.2019.100108 Sustainable Development Goals