depends on the current rate of a stamp. The forever stamp stays at the current rate forever.
Forever stamps have the value of the current First Class Postage Rate. Currently they cost 49 cents. They can be used 'forever' to mail one ounce of US Postage.
There is none. The current cost of a First Class Stamp in the US is 44 cents. A Forever Stamp also costs 44 cents.
Currently you can get one stamp for 44 cents. A book would be $8.80. The Forever stamp is worth the cost to mail one ounce of first class mail. It will always be worth that much regardless of how much it costs at the post office.
Currently in the US a Forever stamp costs 44 cents and I will assume that this the type you are referring to, so a book of twenty stamps would cost you $8.80.
Yes, their value will increase when the cost of postage goes up. And you will pay the current cost for stamps at the post office.
In the US postage stamps are always valid. You do still have to have enough to cover the current postage cost. And Forever stamps are always valid for one ounce of first class mail, regardless of the actual cost.
$44.oo for 100 stamps at $.44 each
That is the purpose of the Forever Stamps. They always equal the first class cost. It does not matter what you pay for them.
You cannot use the Forever Stamps on foreign postage. The international agreement indicates that value must be shown on stamps used for international mail. The current cost for up to one ounce is 98 cents.
SPS Forever stamps are valued at the current rate/cost of mailing a first-class "standard-size" envelopes within the USA. Currently the USPS charges 42 cents. The benefit of Forever Stamps are that their value changes with the rate to match any increases.
Definitely, they do cost .45 now