Ricardo's best-known contributions to economics was the labor theory of value. The labor theory of value states that the value of a good could be measured by the labor that it took to produce it. The theory stated that the cost should not be based on the compensation paid for the labor, but on the total cost of production.
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The telegraph changed society by facilitating communications among Americans. The telegraph gave Americans the chance to send and receive messages at an unprecedented speed and volume. Professor Samuel Morse, an instructor at New York University, created the first version of the telegraph in the 1830s, and, although well-planned, the device required significant revisions before allowing communications between the East and West coasts and eventually overseas
Oregon trail because this is the anwere in i have to write 20 charictars
A. Enforcing immigration laws is not a power of the United States Congress because that is a power of the White House
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