Micro small doubt! Pls Help!

[Shefali]

When a perfectly competitive firm and industry are both in equilibrium
a P=MR=SMC=LMC
b P=MR=SAC=LAC
c P=MR=lowest pt on LAC curve
d all of the above..

[Homer Simpson]

1(d) i think!

[Ashima]

yeah its d!

[Shefali]

Thanxx.pls tell me 1 more thing.If MRTS increases then slope of isoquant increases or decreses??

[Ashima]

MRTS is the slope of isoquant. When it increases that means the slope increases. Isn't it?

[Homer Simpson]

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[Ashima]

I think I got it:

MRTS= -{dk/dl}

Now this dk/dl is the slope of isoquant. So there is an inverse relation. So when MRTS increases, slope decreases and vice-versa.

[Ashima]

Isn't it opposite tsuki? MRTS = negative the slope of isoquant?

[Homer Simpson]

yeah thats right! mixed up with MRS

[Shefali]

I think it increases...i'm getting confused now..

[The Villain]

If MRTS increases ,then isoquants are concave.
Hence slope increases.
You can do the other way round too...MRTS decreases along an isoquant,so if we go upwards isoqant becomes steeper..
Therefore ans is slope increases.

[Shefali]

Thanxx Ron

[SoniaKapoor]

It is d!!