The supply and demand relationship in each market determines how much of the inflation can be priced into rental rates.

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"This is not about pragmatic supply and demand but is about the relationship between the state and the person who has passed away, " he said.

BBC: Northern Ireland Assembly

Second, remember that benchmark prices for oil do not have a strong relationship to supply and demand.

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In a more complex economy, the relationship between production (supply) and spending (demand) still holds.

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