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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.

References in periodicals archive ?
The implication is that drugs that are chemically closely related have the same target of action and are therefore subject to cross-resistance, and vice versa.
While the rrs A514C mutation is associated with high-level resistance to STR, the most common rrs mutation conferring AMK and KAN resistance (rrs A1401G) does not confer STR cross-resistance.
Nevertheless, the results of the current study suggest that at least some levels of cross-resistance to the 3 pyramided Bt corn traits exist in Cry1F corn resistant S.
pneumoniae antimicrobial drug resistance among US inpatients, resistance patterns by specimen source, and cross-resistance among imipenem-resistant K.
Patients who receive fluoroquinolones before starting standard anti-TB treatment have poorer outcomes than do patients who do not receive fluoroquinolones, because of the emergence of drug-resistant TB probably due to cross-resistance among fluoroquinolones (9).
Early failure of a first regimen--there is unlikely to be much cross-resistance.
It appears that alterations in the membrane fluidity of the acid-tolerant strains might confer cross-resistance to other stresses.
Several possible mechanisms are reviewed that could explain the partial lack of cross-resistance including type of previous therapy, biological characteristics of tumour, pharmacological efficacy of the different AIs, bioavailability of AIs in tumour tissue, aromatase enzyme variants and different promoters, and the importance of the irreversibility of AIs such as exemestane or its partial androgen agonistic effects.
Its future impact remains difficult to predict but limited access to viral load monitoring and delayed switches based on CD4 cell counts and clinical parameters dictate that significant accumulation of resistance and cross-resistance is likely to occur in patients with virological failure.
Linezolid--ADULT--600 mg every 12 h iv or 600 mg twice per day po--CHILDREN--10 mg/kg every 12 h iv or po Bacteriostatic; limited clinical experience; no cross-resistance with other antibiotic classes; expensive; may eventually replace other second-line agents as a preferred agent for oral therapy of MRSA infections"
One area of concern dealt with the potential resistance and cross-resistance to these drugs.