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David Bradford , an influential tax economist who devised an innovative way to change the income-tax system to encourage people to save and invest more , died on Tuesday in Philadelphia .
 place of death: David Bradford, Philadelphia
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: ethnicity, place lived, geographic distribution, company industry, country of administrative divisions, administrative division of country, location contains, person of company, profession, ethnicity of people, company shareholder among major shareholders, sports team of location, religion, neighborhood of, company major shareholders, place of death, nationality, children, company founders, company founded place, country of capital, company advisors, sports team location of teams, place of birth 
Text: {0} 
 Entity Pairs:  David Bradford, Philadelphia 
Answer:
 place of death: David Bradford, Philadelphia