How did imperial preference shape colonial economies such as India's in the 1920s–30s?

Imperial preference — mutual tariff concessions within the British Empire — became the Empire's economic framework in the interwar years. For India it delivered the trade effects of a bloc without the bargaining power of a partner, because political status decided who negotiated.

From persuasion to tariffs

• Before 1932, British law barred duties on food imports, so the Empire could only persuade buyers: the Empire Marketing Board (1926–33) ran a reported £1,000,000 scheme for "advertising the empire" [1][2].
• Once tariffs became available, publicity was redundant. The Ottawa Imperial Economic Conference (1932) ended Britain's 86-year-old free trade policy, admitting most Empire goods freely while taxing foreign food and metal imports [3].

Effect on India's economic structure

• India signed a bilateral Ottawa agreement with Britain, scheduled in British legislation the same year [4].
• Preference secured colonial markets for primary produce — raw cotton, jute, tea, oilseeds — reinforcing the role of raw-material supplier.
• In return, Indian markets stayed open to British manufactures, restraining the tariff protection Indian industry sought. A wall aimed outward also held the colony in place.

The asymmetry of status

• The Balfour Report (1926) made Britain and the Dominions "equal in status, in no way subordinate one to another"; the Statute of Westminster, 1931 gave that legislative form [5][6]. India was excluded from both.
• A Dominion negotiated through a government answerable to its own voters; India's terms were settled by an administration answerable to London. Indian opinion therefore read Ottawa as an imposed settlement, feeding the wider demand for fiscal autonomy alongside Purna Swaraj.
• The agreements ran for five years and lapsed after 1937, exposing their fragility [3].

Imperial preference thus locked colonial economies into a complementary, dependent relationship rather than an equal one. Its lesson endures: trade arrangements deliver genuine gains only where the weaker partner holds real negotiating capacity — the principle behind India's later insistence on sovereign economic decision-making and equitable terms in multilateral trade.