Should the currency 'dollar' be capitalized?

Currencies are common nouns. They are always written with the first letter in lower case, unless they are at the beginning of a sentence.

For example :

I have ten euros and fifteen cents.

A dollar in the present is worth more than a dollar in the future.

Dollar slips lower in dull dealings

Euro or dollar, I don't care!

Currencies are common nouns. They are always written with the first letter in lower case, unless they are at the beginning of a sentence and take the plural mark.

For example :

I have ten euros and fifteen cents.

A dollar in the present is worth more than a dollar in the future.

Dollar slips lower in dull dealings

Euro or dollar, I don't care!

Currencies are common nouns. They are always written with the first letter in lower case, unless they are at the beginning of a sentence and take the plural mark.

For example :

A dollar in the present is worth more than a dollar in the future.

Dollar slips lower in dull dealings