erosion

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Volume shrinkage - especially in the banking and transport stocks -- led to marginal erosion in the overall market liquidity.
1p as a survey suggested its share of the domestic grocery market has suffered marginal erosion as shoppers lean towards aggressive discounters in response to food price inflation.
This can be contrasted to psoriatic arthritis, which exhibits marginal erosions in the proximal plate and marginal periostitis in the distal plate at the DIP joints.