At E87.71 there is a letter of Chalmers written at the 'Office for Trade, Whitehall' on 21 July 1788, to the sister of 'the late Mr. Richardson of Kensington' (William Richardson). The letter refers to his objective of doing 'justice to the memory of' Richardson, and goes on to mention the 'essay on the causes of the decline of Foreign trade, which I think was written by Mr. Richardson'. In the letter he says that the essay 'is very generally attributed to Sir Matthew Decker'. He hopes though that he might be informed 'of some facts and circumstances which would enable' him to settle the 'doubtful point in favour' of the woman's brother. He asks if she knows of any papers remaining 'which prove that Mr. Richardson wrote this essay, or anything else'.
Sir Matthew Decker, 1st Baronet (1679-1749) was an English merchant and writer on trade, an MP, and director of the East India Company.