What leverage is in the dealing centre and what is the difference between purchasing and selling prices on currency pairs?
Every currency price we see is always against some other currency
one currency is called base currency and other is quoted currency
like USD INR
USD is base currency and INR is quoted
(Currency pairs are sometimes then written by concatenating the ISO currency codes (ISO 4217) of the base currency and the counter currency, separating them with a slash character. Often the slash character is omitted, alternatively the slash may be replaced by ".", "-", " ", and etc. A widely traded currency pair is the relation of the euro against the US dollar, designated as EUR/USD. The quotation EUR/USD 1.2500 means that one euro is exchanged for 1.2500 US dollars. Here, EUR is the base currency and USD is the counter currency.)
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the difference between two quotes that we see is the "spread" we see.
For physical currency dealer it is the price gap they keep to ensure profits
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and online in trading exchanges it is just the bid ask spread between buyers and sellers.