What is the increase/ (decrease) in Trade and other receivables from Preliminary, November 30, 2018 to Final August 31, 2019?
{"": {"Final": 31, "Preliminary": 30}, "(In thousands of Canadian dollars)": {"Final": "$", "Preliminary": "$"}, "Purchase price -- Consideration paid at closing": {"Final": 38876, "Preliminary": 38876}, "Purchase price -- Balance due on business combinations": {"Final": 5005, "Preliminary": 5005}, "Purchase price -- ": {"Final": 43881, "Preliminary": 43881}, "Net assets acquired -- Trade and other receivables": {"Final": 1308, "Preliminary": 1743}, "Net assets acquired -- Prepaid expenses and other": {"Final": 335, "Preliminary": 335}, "Net assets acquired -- Property, plant and equipment": {"Final": 28785, "Preliminary": 45769}, "Net assets acquired -- Intangible assets": {"Final": 3978, "Preliminary": "\u2014"}, "Net assets acquired -- Goodwill": {"Final": 11093, "Preliminary": "\u2014"}, "Net assets acquired -- Trade and other payables assumed": {"Final": -644, "Preliminary": -644}, "Net assets acquired -- Contract liabilities and other liabilities assumed": {"Final": -974, "Preliminary": -3322}, "Net assets acquired -- ": {"Final": 43881, "Preliminary": 43881}}
trade_final = df["Net assets acquired -- Trade and other receivables"]["Final"]
trade_preliminary = df["Net assets acquired -- Trade and other receivables"]["Preliminary"]
answer = trade_final - trade_preliminary