The excerpt that includes a word (modal) in bold that conveys the meaning of obligation is:
Investments in marketing should promote new businesses (lines 31-32)
To help the economic scenario, the LDA must maintain London (lines 33-34)
With LDAs help London may secure its position (lines 35-36)
London might also profit (line 38)
LDA can help develop with emerging countries. (lines 39-40)
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