The phrase "are often inefficient" is correct and usable in written English.
You can use it when discussing processes, systems, or methods that frequently lack efficiency.
Example: "Many traditional teaching methods are often inefficient, leading to disengaged students and poor learning outcomes."
Alternatives: "frequently lack efficiency" or "tend to be ineffective."
Aid projects are often inefficient.
But they are often inefficient, turning power into heat.
At first, they confirm existing patterns of use that are often inefficient.
The trouble is that these bureaucracies are often inefficient, understaffed and incapable of working properly in rural areas.Politics clearly plays a role.
This is the third time that Bolivia has nationalised its oil industry, and the second that Venezuela has squeezed foreigners (having nationalised in 1975, it invited them back two decades later).How to drive a bargainState-run oil companies are often inefficient.
This, combined with fears that the new bank will continue to enjoy special treatment because of its government links, underscores the extent to which Japan Post Bank's creation has brought into focus issues relating to competition.On the one hand, retail financial services in Japan are often inefficient and unimaginative, and the sector is crying out for the injection of world-class competition.
Early condoms were generally made of animal gut or fish membrane and were often inefficient.
The conversion process is often inefficient, however, with about 75 percent of the wood's heating potential lost.
The European development aid to poorer countries is often inefficient, but Europe's commitment to humanitarian causes internationally has few peers.
Although activity is often inefficient, the task of rescuing persons who are trapped and of getting the injured to first-aid facilities is usually accomplished fairly expeditiously, often before outside help arrives.
