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We were shocked. We had just assumed that if millions of children were dying and they could be saved, the world would make it a priority to discover and deliver the medicines to save them. But it did not. For under a dollar, there were interventions that could save lives that just werent being delivered.

I don't know what 'for under a dollar' and 'intervention' here exactly mean.

Is it right if I understand the sentence as 'By less than one dollar, we could save lives that just weren't being delivered'?
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I think it means that medicines or other treatments were available, but were not being delivered (to the places where they were needed to save children), even though the cost was less than one dollar. (It doesn't exactly say one dollar would be the cost for each life saved, but I think that's the implication.)

"Intervention" here means something done to help save lives -- it could be delivering medicine, or vaccinations, or creating a way to provide clean water, or something else to prevent deaths.

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Could I ask you one more?

For under a dollar, there were interventions that could save lives that just weren’t being delivered.

Can't 'deliver' here mean 'to rescue sb from sth bad'?

I thought it as 'For under a dollar, there were interventions that could save lives that just weren't being saved (so died)'
For under a dollar, there were interventions that could save lives that just weren’t being delivered.

To paraphrase it, I'd say it means although the costs of some interventions may be under a dollar, they just weren't being delivered, and these interventions could save lives.

Deliver in "deliver interventions" means carry out or perform

It's just my boldly guess.
Ahn, you're right that "deliver" can sometimes mean "save someone from something," and the way the sentence is written it's not absolutely clear whether it's the interventions that "just weren't being delivered" or the lives. The sentence is not very well written. But we don't usually talk about "lives being delivered" the same way you would refer to "lives being saved." "Deliver" is more often used in dramatic, poetic or, usually, biblical or religious contexts -- "Lord, deliver us from evil!" In the example given, I believe it means that the interventions (actions) that could have saved lives were not being delivered (brought) to the people who needed them.

Does that make sense?
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I understand. Thank you for the explanation!