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An effective upper bound on prices achieved because of many willing sellers at that price level.

Resistance Level

In technical analysis, a price that a security does not, or only rarely, rise above. Technical analysts identify a resistance level by looking at past performance. When the security approaches the resistance level, it is seen as an indication to sell the security, which will increase the supply, causing the security's price to fall back below the resistance level. If there are too many buyers, however, the security rises above the resistance level. When this occurs, the price of the security will likely continue to rise until it finds another resistance level. It is also called the overhead resistance level. See also: Price ceiling, Support (Support level).


An increased supply of a security. Compare support.


Resistance, or resistance level, is the top of a stock's current trading range, and the point at which the price is higher than investors are willing to pay. As stockholders sell at resistance level, the stock price goes down because supply exceeds demand.

For example, if, on a repeated basis, as stock A's price reaches $60, stockholders begin to sell, then $60 is considered its resistance level. But a trading range isn't fixed and investor attitudes change, so the resistance level tends to move higher or lower over time.

If stock A rises to $63 without a surge of selling, the current resistance line has been breached. This may be the result of a rising market or a bullish assessment of the stock's value. On the other hand, if selling increases at $57, that may become the new resistance level.

Conversely, the level at which demand exceeds supply and investors typically buy a certain stock is called support. It's the point that's considered the bottom of a stock's current trading range.

Technical analysts use the concepts of resistance and support in anticipating future stock price movements.

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So if you're a good parent and always take your kid to the doctor, your child is much more likely to have a resistant pneumococci because the child received so many antibiotics.
All of the isolates were susceptible to vancomycin, but 121 were resistant to at least two of the antibiotics used in swine production; 115 were resistant to three.
Researchers are concerned that manufactured genes for herbicide tolerance, and pest and viral resistance might escape and, through cross pollination, insert themselves into the genetic makeup of weedy relatives, creating weeds that are resistant to herbicides, pests and viruses.
They (bacteria) become resistant to these powerful antibiotics.
Twelve men and women each drank a glass of milk laced with 10 million bacteria from pigs and chickens resistant to either vancomycin or virginiamycin.
We have reported just 1 case of infection with an almost completely resistant gram-negative organism.
If livestock develop resistant bacteria (SN: 7/18/98, p.
pneumoniae), the most common cause of respiratory tract infections, including resistant strains.
To better study the impact of rpoB mutation on meningococcal virulence we constructed an isogenic mutant strain, NM05-08, by transforming the susceptible isolate LNP21362 with a PCR-amplified fragment from a resistant isolate (LNP22330), as previously described (6).
Tulkens claims a better system would target a so-called mutant prevention concentration (MPC), the amount required to prevent emergence of mutant, resistant strains in vitro by actually killing the bacterium.
Because he found resistant bacteria both near major cities and in remote areas, Ash says, "I can't say that I see any patterns.