Что (кто) такое visible bell - определение
![blocks]] some wavelengths of electromagnetic radiation, but in visible light it is mostly transparent](https://commons.wikimedia.org/wiki/Special:FilePath/Atmospheric electromagnetic opacity.svg?width=200 "blocks]] some wavelengths of electromagnetic radiation, but in visible light it is mostly transparent")
![[[Laser]] beams with visible spectrum](https://commons.wikimedia.org/wiki/Special:FilePath/Light Amplification by Stimulated Emission of Radiation.jpg?width=200 "[[Laser]] beams with visible spectrum")
![Newton's observation of prismatic colors ([[David Brewster]] 1855)](https://commons.wikimedia.org/wiki/Special:FilePath/Newton prismatic colours.JPG?width=200 "Newton's observation of prismatic colors ([[David Brewster]] 1855)")
![Approximation of spectral colors on a display results in somewhat distorted [[chromaticity]]](https://commons.wikimedia.org/wiki/Special:FilePath/Spectrum.svg?width=200 "Approximation of spectral colors on a display results in somewhat distorted [[chromaticity]]")
![Old [[Bell Labs Holmdel Complex]]. Located in New Jersey, about 20 miles south of New York.](https://commons.wikimedia.org/wiki/Special:FilePath/Bell Labs Holmdel.jpg?width=200 "Old [[Bell Labs Holmdel Complex]]. Located in New Jersey, about 20 miles south of New York.")
![Reconstruction of the directional antenna used in the discovery of radio emission of extraterrestrial origin by [[Karl Guthe Jansky]] at [[Bell Telephone Laboratories]] in 1932](https://commons.wikimedia.org/wiki/Special:FilePath/Green Banks - Jansky Antena.jpg?width=200 "Reconstruction of the directional antenna used in the discovery of radio emission of extraterrestrial origin by [[Karl Guthe Jansky]] at [[Bell Telephone Laboratories]] in 1932")
.jpg?width=200 "50px")
![point-contact]] [[germanium]] device, was invented at Bell Laboratories in 1947. This image shows a replica.](https://commons.wikimedia.org/wiki/Special:FilePath/Replica-of-first-transistor.jpg?width=200 "point-contact]] [[germanium]] device, was invented at Bell Laboratories in 1947. This image shows a replica.")
Википедия
The visible trade balance (merchandise trade balance) is that part of the balance of trade figures that refers to international trade in physical goods, but not trade in services; it thus contrasts with the invisible balance.
The balance is calculated as the value of visible exports less the value of visible imports. If the figure is positive then this is a surplus; it is negative then it is a deficit.
Most countries do not have a zero visible balance: they usually run a surplus or a deficit. This will be offset by trade in services, other income transfers, investments and monetary flows, leading to an overall balance of payments. The visible balance is affected by changes in the volumes of imports and exports, and also by changes in the terms of trade.
In aggregate, the World often appears to have a negative visible balance with itself; i.e. imports of goods appear to exceed exports. There are numerous causes for this, such as measuring imports on a cost, insurance and freight basis while measuring exports on a free on board basis, or statistical errors occurring when imports are more closely recorded than exports.
