Translation of Wirtschaftlichkeit

Do you want to proceed with entering more words or do you want to wait for the new design. For me, both options are ok. You could add the language in parenthesis after the sentence. We'll see within one week those we really need.
This afternoon I will fly to Chile. My two brothers and sisters live there. They are also very old and my brother has already died. My parents emigrated 30 years ago, but they wanted to stay.
Thanks again for your letter. For now, the weather here is like it is in your country, ice cold. I will write you a letter in Spanish and in English. So you can compare the sentences.