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microeconomics - symbol help

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    sorry for the mundane/short question, but if any one knows what the following symbols represent i'd be really grateful for any answers!

    a-
    z-

    they're in formulae relating to exchange efficiency.

    & additionally does any one know any good 'symbol index' sites? nothing has come up on google!

    TIA and positive rep to any one that can pls help! xox
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    Z - Other factors?

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