Reconciling this with altruistic behaviour would require altruism to be adaptive for the individual as much as the group.

During the late 1960s, the study of altruistic behaviour in the natural world made exceptional progress.

This means that genes promoting costly altruistic behaviour in their carriers can sometimes spread because they promote the survival of gene copies in relatives.

Financial incentives, then, can crowd out altruistic behaviour.

Economists assume that incentives such as these add to altruistic behaviour.

Some people do it for altruistic reasons, but the result may be the same.

Perhaps they are mastering the art of 'polite social lying' or how to lie for altruistic reasons.

Unfortunately, he doesn't want them for altruistic reasons.

In my experience the overwhelming majority of them volunteer their time, energy and skills for (possibly) altruistic reasons and not because they expect to gain materially in any way.

Rise says it puts staff first - but not for purely altruistic reasons.

Well, it's not an entirely altruistic venture on their part.

At first glance, its motives seem entirely altruistic.

The car rental industry's support for the bill isn't entirely altruistic.

They realise too late that his motives might not be entirely altruistic.

Their motives were not entirely altruistic; the consortium hoped to profit by selling prints.