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;doc: declaring market prices: clarify based on chat feedback

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Simon Michael 2021-06-23 12:47:02 -10:00
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@ -2529,21 +2529,22 @@ These are often obtained from a
cryptocurrency exchange, or the
[foreign exchange market](https://en.wikipedia.org/wiki/Foreign_exchange_market).
Here is the format:
The format is:
```journal
P DATE COMMODITYA COMMODITYBAMOUNT
P DATE COMMODITY1SYMBOL COMMODITY2AMOUNT
```
- DATE is a [simple date](#simple-dates)
- COMMODITYA is the symbol of the commodity being priced
- COMMODITYBAMOUNT is an [amount](#amounts) (symbol and quantity) in a
second commodity, giving the price in commodity B of one unit of commodity A.
These two market price directives say that one euro was worth 1.35 US dollars during 2009,
and $1.40 from 2010 onward:
DATE is a [simple date](#simple-dates),
COMMODITY1SYMBOL is the symbol of the commodity being priced,
and COMMODITY2AMOUNT is the [amount](#amounts) (symbol and quantity) of commodity 2
that one unit of commodity 1 is worth on this date.
Examples:
```journal
P 2009/1/1 € $1.35
P 2010/1/1 € $1.40
# one euro was worth $1.35 from 2009-01-01 onward:
P 2009-01-01 € $1.35
# and $1.40 from 2010-01-01 onward:
P 2010-01-01 € $1.40
```
The `-V`, `-X` and `--value` flags use these market prices to show amount values