Question

合同法的案例

甲要与乙签合同卖东西给乙,乙回复时甲不在，托付甲的妈妈告诉甲~甲的妈妈忘记了告诉甲了，甲就把东西卖给了别人。
甲是否有承担违约的责任？
William wrote to Joshua on 3rd January 2011, offering to sell various items of plant and machinery for £30,000. The letter included the following statement:
“Notice in writing of your acceptance of this offer must be received by me at 16th January 2011.”
Joshua decided to accept and posted his acceptance on 9th January 2011. Joshua had called William personally but he was not in and therefore left a message with William’s mother, Stephanie confirming his acceptance of the offer.
Joshua had since discovered that William never received the letter of acceptance and that Stephanie had forgotten to inform him of the telephone conversation. William had sold the plant to Joseph.

Answer 1

您好。如果甲的母亲可以代理甲，那么，合同成立，甲承担违约责任。但是，如果甲的母亲只做为一般的传话人，那么，乙应当承担传话人传话过程中可能发生的风险，因此，话未传到时乙自负责任，合同未成立，甲不承担违约责任。
参考内容：法律界网站法务通VV

Answer 2

楼主你好

1、甲与乙之间：
买卖合同自承诺到达受要约人时成立，本案例中，乙向甲发出的承诺并没有到达甲，故，买卖合同未成立，更谈不上生效。故甲无需承担违约责任。

2、乙与甲母之间。
此时，乙与甲母之间存在委托合同，若甲母未及时告知甲，则甲母构成违约。
甲母只是乙的意思通知人。

综上所述，甲不用承担违约责任

Answer 3

乙（受要约人）回复（承诺）必须向甲（要约人）作出，因为受要约人承诺的目的在于同要约人订立合同，因此承诺只有向要约人（包括其代理人）作出才有意义。而本案甲的妈妈不是甲的代理人，故乙的回复不构成承诺，合同未成立，因此甲不需要承担责任。

Answer 4

从题中可以看出，甲已向乙发出了要约，乙也发出了承诺，因为我国采取到达主义，所以乙把承诺告诉甲的妈妈视为承诺到达甲，此时甲乙之间合同成立，互负义务，甲不履行义务应承担违约责任。

Answer 5

如果考虑要约、承诺的话，甲向乙发出要约，乙同意了，就视为合同成立。乙答复给甲母，视为承诺已经送达到甲。当然，如果甲发出的不是要约，而是要与乙签订合同的意向，那么应该视为是要约邀请，乙的答复是要约，合同未成立