Did {Herbert Marcuse} {field of work} {economics}?
Did Herbert Marcuse work as an economist?
Was Herbert Marcuse an economist?
ASK WHERE { resource:Herbert_Marcuse property:field_of_work resource:economics }
 ASK { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q60030> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P101> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q8134>. } 
ASK WHERE { wd:Q60030 wdt:P101 wd:Q8134 }