One question is the impact of the repeal of the Corn Laws in the late 1840s whose effects would only become clear after the 1850 cutoff of this study. A second is where did all those exports go especially all those nick-nacks, beer etc.? The Empire was still on the rise in those days so was the volume helped along by captive colonial markets? Monopolistic control pushes the probability inference lower. Branding in the loosest sense is important too. The wealthiest people in the colonies were likely British or of British origin & thus habituated to British products. You could probably call the demand from the wealthy plantation sector of the US South "colonial" demand in this sense.
One question is the impact of the repeal of the Corn Laws in the late 1840s whose effects would only become clear after the 1850 cutoff of this study. A second is where did all those exports go especially all those nick-nacks, beer etc.? The Empire was still on the rise in those days so was the volume helped along by captive colonial markets? Monopolistic control pushes the probability inference lower. Branding in the loosest sense is important too. The wealthiest people in the colonies were likely British or of British origin & thus habituated to British products. You could probably call the demand from the wealthy plantation sector of the US South "colonial" demand in this sense.